ASRock BB50M Steel Legend WiFi Motherboard User Manual

User Manual for ASRock models including: BB50M Steel Legend WiFi Motherboard, BB50M, Steel Legend WiFi Motherboard, Legend WiFi Motherboard, WiFi Motherboard, Motherboard

Manual

ASRock B850M Steel Legend WiFi (90-MXBS2-A0UAYZ) starting from £ 173.59 (2025) | Price Comparison Skinflint UK

ASRock B850M Steel Legend WiFi Manual

File Info : application/pdf, 73 Pages, 5.49MB

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Contact Information
If you need to contact ASRock or want to know more about ASRock, you're welcome to visit ASRock's website at http://www.asrock.com; or you may contact your dealer for further information. For technical questions, please submit a support request form at https://event.asrock.com/tsd.asp ASRock Incorporation e-mail: info@asrock.com.tw ASRock EUROPE B.V. e-mail: sales@asrock.nl ASRock America, Inc. e-mail: sales@asrockamerica.com
Scan the QR code to view more manuals and documents.

Contents

Chapter 1 Introduction

1.1 Package Contents

1.2 Specifications

1.3 Motherboard Layout

1.4 I/O Panel

1.5 Block Diagram

1.6 802.11be Wi-Fi 7 Module and ASRock WiFi 2.4/5/6 GHz

Antennas

Chapter 2 Installation

2.1 Installing the CPU

2.2 Installing the CPU Fan and Heatsink

2.3 Installing Memory Modules (DIMM)

2.4 Connecting the Front Panel Header

2.5 Installing the Motherboard

2.6 Installing SATA Drives

2.7 Installing a Graphics Card

2.8 Connecting Peripheral Devices

2.9 Connecting the Power Connectors

2.10 Power On

2.11 Jumpers Setup

2.12 Onboard Headers and Connectors

2.13 Smart Button

2.14 Post Status Checker

2.15 M.2 SSD Installation Guide (M2_1)

2.16 M.2 SSD Installation Guide (M2_2)

2.17 M.2 SSD Installation Guide (M2_3)

B850M Steel Legend WiFi
Chapter 1 Introduction
Thank you for purchasing ASRock B850M Steel Legend WiFi motherboard, a reliable motherboard produced under ASRock's consistently stringent quality control. It delivers excellent performance with robust design conforming to ASRock's commitment to quality and endurance.
Because the motherboard specifications and the BIOS software might be updated, the content of this documentation will be subject to change without notice. In case any modifications of this documentation occur, the updated version will be available on ASRock's website without further notice. If you require technical support related to this motherboard, please visit our website for specific information about the model you are using. You may find the latest VGA cards and CPU support list on ASRock's website as well. ASRock website http://www.asrock.com.
1.1 Package Contents
· ASRock B850M Steel Legend WiFi Motherboard (Micro ATX Form Factor) · 2 x Serial ATA (SATA) Data Cables (Optional) · 2 x ASRock WiFi 2.4/5/6 GHz Antennas (Optional) · 2 x Screws for M.2 Sockets (Optional) · 1 x Standoff for M.2 Socket (Optional) · 1 x Thermistor Cable (Optional)
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1.2 Specifications

Platform CPU

· Micro ATX Form Factor · 2oz Copper PCB
· Supports AMD Socket AM5 RyzenTM 9000, 8000 and 7000 Series Processors*
* The availability of expansion slots may vary by CPU. Please refer to PCIe/M.2 Bandwidth Table for details. (http://www. asrock.com/)

Chipset

· AMD B850

Memory

· Dual Channel DDR5 Memory Technology · 4 x DDR5 DIMM Slots · Supports DDR5 ECC/non-ECC, un-buffered memory up to
8000+(OC)* · Max. capacity of system memory: 256GB · Supports Extreme Memory Profile (XMP) and EXTended
Profiles for Overclocking (EXPO) memory modules * Please refer to Memory Support List on ASRock's website for more information. (http://www.asrock.com/)

Expansion Slot

CPU: · 1 x PCIe 5.0 x16 Slot (PCIE1), supports x16 mode* · 1 x PCIe 4.0 x4 Slot (PCIE2), supports x4 mode* Chipset: · 1 x Vertical M.2 Socket (Key E), supports type 2230 WiFi/BT
PCIe WiFi module
* PCIE1 will run at Gen5x16 with 9000 and 7000 series processors, Gen4x8 with 8000 (Phoenix 1) series processors and Gen4x4 with 8000 (Phoenix 2) series processors. * Supports NVMe SSD as boot disks · 15 Gold Contact in VGA PCIe Slot (PCIE1)

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B850M Steel Legend WiFi

Graphics Audio LAN
Wireless LAN

· Integrated AMD RDNATM graphics (Actual support may vary by CPU)
· 1 x HDMI 2.1 TMDS/FRL 8G Compatible, supports HDR, HDCP 2.3 and max. resolution up to 4K 120Hz
· 1 x DisplayPort 1.4 with DSC (compressed), supports HDCP 2.3 and max. resolution up to 4K 120Hz
· 7.1 CH HD Audio with Content Protection (Realtek ALC1220 Audio Codec)
· Impedance Sensing on Rear Out port · Individual PCB Layers for R/L Audio Channel · Nahimic Audio
· 2.5 Gigabit LAN 10/100/1000/2500 Mb/s · Dragon RTL8125BG · Supports Dragon 2.5G LAN Software
- Smart Auto Adjust Bandwidth Control - Visual User Friendly UI - Visual Network Usage Statistics - Optimized Default Setting for Game, Browser, and
Streaming Modes - User Customized Priority Control
· 802.11be 2x2 Wi-Fi 7 Module · Supports IEEE 802.11a/b/g/n/ac/ax/axe/be · Supports 2.4GHz/5GHz/6GHz* frequency band · Supports 160MHz channel bandwidth with 6GHz* frequen-
cy band * The Wi-Fi 7 module is supported by Microsoft® Windows® 11 only. There is no driver available for Windows® 10. The availability of the 6GHz band will depend on the different regulation status of each country and region. It will be activated (for supported countries) through Windows® Update and software updates once available. · 1 antenna to support 2 (Transmit) x 2 (Receive) diversity
technology · Supports Bluetooth 5.4 · Supports MU-MIMO

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USB

CPU:

· 1 x USB 3.2 Gen2 Type-C (Rear)

· 1 x USB 3.2 Gen2 Type-A (Rear)

· 1 x USB 3.2 Gen1 Type-A (Rear (USB32_2))

Chipset:

· 1 x USB 3.2 Gen1 Type-C (Front)

· 5 x USB 3.2 Gen1 Type-A (1 Rear (USB32_3), 4 Front)

· 8 x USB 2.0 (4 Rear, 4 Front)

* All USB ports support ESD Protection

Rear Panel I/O

· 2 x Antenna Ports · 1 x HDMI Port · 1 x DisplayPort 1.4 · 1 x USB 3.2 Gen2 Type-C Port (10 Gb/s) · 1 x USB 3.2 Gen2 Type-A Port (10 Gb/s) · 2 x USB 3.2 Gen1 Ports* · 4 x USB 2.0 Ports · 1 x RJ-45 LAN Port · 1 x BIOS Flashback Button · HD Audio Jacks: Line in / Front Speaker / Microphone * USB32_23 are Lightning Gaming Ports.

Storage

CPU: · 1 x Blazing M.2 Socket (M2_1, Key M), supports type 2280
PCIe Gen5x4 (128 Gb/s) mode* Chipset: · 1 x M.2 Socket (M2_2, Key M), supports type 2260/2280
PCIe Gen4x2 (32 Gb/s) mode* · 1 x Hyper M.2 Socket (M2_3, Key M), supports type
2260/2280 PCIe Gen4x4 (64 Gb/s) mode* · 4 x SATA3 6.0 Gb/s Connectors
* Supports NVMe SSD as boot disks * M2_1 is the first priority for M.2 installation. * M2_1 will run at Gen5x4 with 9000 and 7000 series processors, Gen4x4 with 8000 (Phoenix 1) series processors and Gen4x2 with 8000 (Phoenix 2) series processors.

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B850M Steel Legend WiFi

RAID

· Supports RAID 0, RAID 1 and RAID 10 for SATA storage devices
· Supports RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage devices*
* Requires additional M.2 NVMe expansion cards to support RAID 10

Connector

· 1 x SPI TPM Header · 1 x Thermistor Cable Header · 1 x Power LED and Speaker Header · 1 x RGB LED Header* · 3 x Addressable LED Headers** · 2 x CPU Fan Connectors (4-pin) (Smart Fan Speed Con-
trol)*** · 3 x Chassis Fan Connectors (4-pin) (Smart Fan Speed Con-
trol)*** · 1 x 24 pin ATX Power Connector (Hi-Density Power Con-
nector) · 1 x 8 pin 12V Power Connector (Hi-Density Power Connec-
tor) · 1 x 4 pin 12V Power Connector (Hi-Density Power Connec-
tor) · 1 x Front Panel Audio Connector · 2 x USB 2.0 Headers (Support 4 USB 2.0 ports) · 2 x USB 3.2 Gen1 Headers (Support 4 USB 3.2 Gen1 ports) · 1 x Front Panel Type C USB 3.2 Gen1 Header * Supports in total up to 12V/3A, 36W LED Strip ** Support in total up to 5V/3A, 15W LED Strip *** CPU_FAN1 supports the fan power up to 1A (12W). *** CPU_FAN2 and CHA_FAN1~3 support the fan power up to 3A (36W). *** CPU_FAN2 and CHA_FAN1~3 can auto detect if 3-pin or 4-pin fan is in use.

BIOS Feature

· AMI UEFI Legal BIOS with GUI support

· Microsoft® Windows® 10 64-bit / 11 64-bit

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Certifications

· FCC, CE · ErP/EuP ready (ErP/EuP ready power supply is required)

* For detailed product information, please visit our website: http://www.asrock.com

Please realize that there is a certain risk involved with overclocking, including adjusting the setting in the BIOS, applying Untied Overclocking Technology, or using third-party overclocking tools. Overclocking may affect your system's stability, or even cause damage to the components and devices of your system. It should be done at your own risk and expense. We are not responsible for possible damage caused by overclocking.

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1.3 Motherboard Layout

B850M Steel Legend WiFi

DP_1

ATX12V1

ATX12V2

HDMI1

BIOS _FB1
USB 3.2 Gen2 T: USB32_1 B: USB32_TC1

CPU_FAN1

RGB_LED1 ADDR_LED3

6
1
7
1
8

ATXPWR1

DDR5_A1 (64 bit, 288-pin module) DDR5_A2 (64 bit, 288-pin module) DDR5_B1 (64 bit, 288-pin module) DDR5_B2 (64 bit, 288-pin module)

CMOS Battery
USB 2.0 USB_4 USB 2.0 USB_3 USB 2.0 USB_2 USB 2.0 USB_1

USB 3.2 Gen1 Top:

T: USB32_2 B: USB32_3

RJ-45

M2_WIFI_2

Top: LINE IN
Center: FRONT
Bottom: MIC IN

CPU_FAN2 LAN

PCIE1

M2_1

SATA3_1

USB32_4_5

SATA3_2

1
12

SPI_TPM_J1

1
AMD

BIOS ROM

B850

USB32_TC2

SATA3_4 SATA3_3

M2_2

AUDIO CODEC
HD_AUDIO1 1
1

PCIE2

RoHS

TB1

ADDR_LED2 ADDR_LED1 CHA_FAN1 CHA_FAN2

USB_7_8

USB_5_6

CHA_FAN3

T_SENSOR1 1

BOOT VGA DRAM CPU

USB32_6_7 1

SPK_PLED1 PLED PWRBTN CLRCMOS1

1 HDLED RESET

PANEL1

M2_3

27 26 25 24 23 22 21

19 18

17 16

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No. Description 1 8 pin 12V Power Connector (ATX12V1) 2 4 pin 12V Power Connector (ATX12V2) 3 CPU Fan Connector (CPU_FAN1) 4 2 x 288-pin DDR5 DIMM Slots (DDR5_A1, DDR5_B1) 5 2 x 288-pin DDR5 DIMM Slots (DDR5_A2, DDR5_B2) 6 Addressable LED Header (ADDR_LED3) 7 RGB LED Header (RGB_LED1) 8 ATX Power Connector (ATXPWR1) 9 Front Panel Type C USB 3.2 Gen1 Header (USB32_TC2) 10 SATA3 Connector (SATA3_1) 11 SATA3 Connector (SATA3_2) 12 USB 3.2 Gen1 Header (USB32_4_5) 13 SPI TPM Header (SPI_TPM_J1) 14 SATA3 Connectors (SATA3_4)(Upper), (SATA3_3)(Lower) 15 System Panel Header (PANEL1) 16 Power LED and Speaker Header (SPK_PLED1) 17 Clear CMOS Jumper (CLRCMOS1) 18 USB 3.2 Gen1 Header (USB32_6_7) 19 Post Status Checker (PSC) 20 Thermistor Cable Header (T_SENSOR1) 21 Chassis Fan Connector (CHA_FAN3) 22 USB 2.0 Header (USB_5_6) 23 USB 2.0 Header (USB_7_8) 24 Chassis Fan Connector (CHA_FAN2) 25 Chassis Fan Connector (CHA_FAN1) 26 Addressable LED Header (ADDR_LED1) 27 Addressable LED Header (ADDR_LED2) 28 Front Panel Audio Header (HD_AUDIO1) 29 CPU Fan Connector (CPU_FAN2)
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1.4 I/O Panel

B850M Steel Legend WiFi

11 10

No. Description 1 2.5G LAN RJ-45 Port* 2 Line In (Light Blue)** 3 Front Speaker (Lime)** 4 Microphone (Pink)** 5 Antenna Ports 6 USB 3.2 Gen1 Ports (USB32_23)***

No. Description 7 USB 2.0 Ports (USB_1234) 8 USB 3.2 Gen2 Type-A Port (USB32_1) 9 USB 3.2 Gen2 Type-C Port (USB32_TC1) 10 BIOS Flashback Button 11 HDMI Port 12 DisplayPort 1.4

*There are two LEDs on each LAN port. Please refer to the table below for the LAN port LED indications.

ACT/LINK LED SPEED LED

LAN Port

Activity / Link LED

Status Off

Description No Link

Blinking

Data Activity

Link

Speed LED Status Off
Orange
Green

Description 10Mbps connection 100Mbps/1Gbps connection 2.5Gbps connection

** Function of the Audio Ports in 7.1-channel Configuration:

Port

Function

Light Blue (Rear panel) Lime (Rear panel) Pink (Rear panel) Lime (Front panel)

Rear Speaker Out Front Speaker Out Central /Subwoofer Speaker Out Side Speaker Out

*** USB32_23 are Lightning Gaming Ports.
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1.5 Block Diagram
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DDR5 Slot x2 DDR5 Slot x2 HDMI Port Audio Codec ALC1220 Flash ROM SIO NCT6796D-S

Channel A Channel B DP0 AZ(HD Audio) SPI eSPI

Rear USB 3.2 Gen1 1 port

5Gb/s

Front USB 2.0 4 port

USB2.0 Hub GL852

Front USB 3.2 Gen1 Type C

Front USB 3.2 Gen1 4 port Rear USB 3.2 Gen1 1 port Rear USB 2.0 4 port

480Mb/s 5Gb/s 5Gb/s 5Gb/s 480Mb/s

SATA 4 port

SATA 6Gb

AMD AM5 Processor LGA1718

x16 Gen4 x4 Gen5 x4 Gen4

PCIe x16 Gen5 Slot M.2(PCIe x4) PCIe x4 Slot

10Gb/s

PCIe x4 Gen4 BUS

x4 Gen4

1st AMD PROM21 Chipset

x2 Gen4 x1 x1

ReDriver Rear USB 3.2 Gen2 Type C ReDriver Rear USB 3.2 Gen2 Type A
M.2(PCIe x4 Gen4) M.2(PCIe x2 Gen4) Realtek RTL8125 2.5G LAN Key E WiFi

B850M Steel Legend WiFi
1.6 802.11be Wi-Fi 7 Module and ASRock WiFi 2.4/5/6 GHz Antennas
802.11be Wi-Fi 7 + BT Module
This motherboard comes with an exclusive 802.11 a/b/g/n/ac/ax/axe/be Wi-Fi 7 + BT v5.4 module that offers support for 802.11 a/b/g/n/ac/ax/axe/be Wi-Fi 7 connectivity standards and Bluetooth v5.4. Wi-Fi 7 + BT module is an easy-to-use wireless local area network (WLAN) adapter to support Wi-Fi 7 + BT. Bluetooth v5.4 standard features Smart Ready technology that adds a whole new class of functionality into the mobile devices. * The transmission speed may vary according to the environment. * The Wi-Fi 7 module is supported by Microsoft® Windows® 11 only. There is no driver available for Windows® 10. The availability of the 6GHz band will depend on the different regulation status of each country and region. It will be activated (for supported countries) through Windows® Update and software updates once available.
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WiFi Antennas Installation Guide
Step 1 Prepare the WiFi 2.4/5/6 GHz Antennas that come with the package. Step 2 Connect the two WiFi 2.4/5/6 GHz Antennas to the antenna connectors. Turn the antenna clockwise until it is securely connected.
Step 3 Set the WiFi 2.4/5/6 GHz Antenna as shown in the illustration. *You may need to adjust the direction of the antenna for a stronger signal.
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B850M Steel Legend WiFi
Chapter 2 Installation
This is a Micro ATX form factor motherboard. Before you install the motherboard, study the configuration of your chassis to ensure that the motherboard fits into it.
Pre-installation Precautions
Take note of the following precautions before you install motherboard components or change any motherboard settings. · Make sure to unplug the power cord before installing or removing the motherboard
components. Failure to do so may cause physical injuries and damages to motherboard components. · In order to avoid damage from static electricity to the motherboard's components, NEVER place your motherboard directly on a carpet. Also remember to use a grounded wrist strap or touch a safety grounded object before you handle the components. · Hold components by the edges and do not touch the ICs. · Whenever you uninstall any components, place them on a grounded anti-static pad or in the bag that comes with the components. · When placing screws to secure the motherboard to the chassis, please do not overtighten the screws! Doing so may damage the motherboard.
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2.1 Installing the CPU
1. Before you insert the 1718-Pin CPU into the socket, please check if the PnP cap is on the socket, if the CPU surface is unclean, or if there are any bent pins in the socket. Do not force to insert the CPU into the socket if above situation is found. Otherwise, the CPU will be seriously damaged.
2. Unplug all power cables before installing the CPU.
Tutorial Video
Turn your CPU to the correct orientation before opening the CPU socket cover.
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B850M Steel Legend WiFi

A B

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Carefully place the CPU in as flat as possible. Do not drop it.
15

Make sure the CPU is aligned with the socket before locking it into place.
7
Make sure the black cover plate is always in place until it pops off when closing the socket lever.
Please save the cover if the processor is removed. The cover must be placed if you wish to return the motherboard for after service.
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B850M Steel Legend WiFi
2.2 Installing the CPU Fan and Heatsink
After you install the CPU into this motherboard, it is necessary to install a larger heatsink and cooling fan to dissipate heat. You also need to spray thermal grease between the CPU and the heatsink to improve heat dissipation. Make sure that the CPU and the heatsink are securely fastened and in good contact with each other.
Please turn off the power or remove the power cord before changing a CPU or heatsink.
Installing the CPU Cooler (Type 1)
1
2
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3
4
CPU_FAN1
18

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Installing the CPU Cooler (Type 2)
1

B850M Steel Legend WiFi

English

3
4
CPU_FAN1
20

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B850M Steel Legend WiFi
5

CPU_FAN1

+12V

RGB_LED1

*The illustrations shown here are for reference purposes only and may not exactly match the model you purchase.

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Installing the CPU Cooler (Type 3)
1
2
22

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B850M Steel Legend WiFi
3 4
23

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5
CPU_FAN1
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B850M Steel Legend WiFi
6

CPU_FAN1

+12V

RGB_LED1

CPU_FAN1

RGB_LED1

USB_1_2

Please note that only one cable should be used at a time in this step. If you select RGB_LED1, please install ASRock utility "ASRock Polychrome SYNC". If you select USB connector, please install AMD utility "SR3 Settings Software".
*The illustrations shown here are for reference purposes only and may not exactly match the model you purchase.

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2.3 Installing Memory Modules (DIMM)
This motherboard provides four 288-pin DDR5 (Double Data Rate 5) DIMM slots, and supports Dual Channel Memory Technology.
1. For dual channel configuration, you always need to install identical (the same brand, speed, size and chip-type) DDR5 DIMM pairs.
2. It is unable to activate Dual Channel Memory Technology with only one or three memory module installed.
3. It is not allowed to install a DDR, DDR2 , DDR3 or DDR4 memory module into a DDR5 slot; otherwise, this motherboard and DIMM may be damaged.
4. The DIMM only fits in one correct orientation. It will cause permanent damage to the motherboard and the DIMM if you force the DIMM into the slot at incorrect orientation.

Recommended Memory Configuration

1 DIMM

2 DIMMs

4 DIMMs

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B850M Steel Legend WiFi 1 2
3 27

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2.4 Connecting the Front Panel Header
1

323:2(5:(/5(/'('

32:(+5'6:'/('5(6(76:
2

HDD LED RESET SW

3$1(/

System Panel Header
10 9

Front Panel Wires

Power SW (-) B
Power SW (+)

RESET SW (+) D
RESET SW (-)

Power LED (-) A
Power LED (+)

HDD LED (-)

HDD LED (+)

21 PANEL1

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2.5 Installing the Motherboard

B850M Steel Legend WiFi

TB 1

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2.6 Installing SATA Drives
1
Optical Drive SATA Drive
2
SATA Data Cable
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B850M Steel Legend WiFi 3 4
SATA Power Connector SATA Data Connector
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2.7 Installing a Graphics Card
1
2 1
3
CLICK! 4
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B850M Steel Legend WiFi Removing a Graphics Card from PCIE1 Slot
Please follow the steps below to release the PCIe slot latch on PCIE1 and remove the graphics card.
1
1. Press down the latch to release the graphics card from the PCIe slot.
2
2. You can now easily remove the graphics card from the PCIe slot. *Please ensure that the system power cable is removed when removing the graphics card.
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Expansion Slots (PCIe Slots)
There are 2 PCI Express slots on the motherboard.
Before installing an expansion card, please make sure that the power supply is switched off or the power cord is unplugged. Please read the documentation of the expansion card and make necessary hardware settings for the card before you start the installation.
PCIe slots: PCIE1 (PCIe 5.0 x16 slot) is used for PCIe x16 lane width graphics cards. PCIE2 (PCIe 4.0 x4 slot) is used for PCIe x4 lane width graphics cards. * PCIE1 will run at Gen5x16 with 9000 and 7000 series processors, Gen4x8 with 8000 (Phoenix 1) series processors and Gen4x4 with 8000 (Phoenix 2) series processors.
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2.8 Connecting Peripheral Devices

B850M Steel Legend WiFi

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2.9 Connecting the Power Connectors

$7;9

$7;3:5

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2.10 Power On

B850M Steel Legend WiFi

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2.11 Jumpers Setup
The illustration shows how jumpers are setup. When the jumper cap is placed on the pins, the jumper is "Short". If no jumper cap is placed on the pins, the jumper is "Open".
Clear CMOS Jumper (CLRCMOS1) (see p.7, No. 17) CLRCMOS1 allows you to clear the data in CMOS. The data in CMOS includes system setup information such as system password, date, time, and system setup parameters. To clear and reset the system parameters to default setup, please turn off the computer and unplug the power cord, then use a jumper cap to short the pins on CLRCMOS1 for 3 seconds. Please remember to remove the jumper cap after clearing the CMOS. If you need to clear the CMOS when you just finish updating the BIOS, you must boot up the system first, and then shut it down before you do the clear-CMOS action.
CLRCMOS1 2-pin Jumper Short: Clear CMOS Open: Default
1 TB 1
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B850M Steel Legend WiFi
2.12 Onboard Headers and Connectors
Onboard headers and connectors are NOT jumpers. Do NOT place jumper caps over these headers and connectors. Placing jumper caps over the headers and connectors will cause permanent damage to the motherboard.
System Panel Header (9-pin PANEL1) (see p.7, No. 15) Connect the power button, reset button and system status indicator on the chassis to this header according to the pin assignments below. Note the positive and negative pins before connecting the cables.
PANEL1
PLED+ PLEDPWRBTN# GND
1 GND
RESET# GND HDLEDHDLED+
1 TB 1
PWRBTN (Power Button): Connect to the power button on the chassis front panel. You may configure the way to turn off your system using the power button. RESET (Reset Button): Connect to the reset button on the chassis front panel. Press the reset button to restart the computer if the computer freezes and fails to perform a normal restart. PLED (System Power LED): Connect to the power status indicator on the chassis front panel. The LED is on when the system is operating. The LED keeps blinking when the system is in S1/S3 sleep state. The LED is off when the system is in S4 sleep state or powered off (S5). HDLED (Hard Drive Activity LED): Connect to the hard drive activity LED on the chassis front panel. The LED is on when the hard drive is reading or writing data. The front panel design may differ by chassis. A front panel module mainly consists of power button, reset button, power LED, hard drive activity LED, speaker and etc. When connecting your chassis front panel module to this header, make sure the wire assignments and the pin assignments are matched correctly.
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Power LED and Speaker Header (7-pin SPK_PLED1) (see p.7, No. 16) Please connect the chassis power LED and the chassis speaker to this header.
SPK_PLED1
SPEAKER DUMMY DUMMY +5V 1 PLED+ PLED+
PLED-
1 TB 1
Serial ATA3 Connectors Vertical: (SATA3_1) (see p.7, No. 10) (SATA3_2) (see p.7, No. 11) Right Angle: (SATA3_3) (see p.7, No. 14)(Lower) (SATA3_4) (see p.7, No. 14)(Upper) These four SATA3 connectors support SATA data cables for internal storage devices with up to 6.0 Gb/s data transfer rate.
1 TB 1
40

SATA3_4 SATA3_2 SATA3_1
SATA3_3

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B850M Steel Legend WiFi
USB 2.0 Headers (9-pin USB_5_6) (see p.7, No. 22) (9-pin USB_7_8) (see p.7, No. 23) There are two headers on this motherboard. Each USB 2.0 header can support two ports.

1 TB 1
USB_7_8
USB_PWR PP+ GND DUMMY
1 GND
P+ PUSB_PWR

USB_5_6
USB_PWR PP+ GND DUMMY
1 GND
P+ PUSB_PWR

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USB 3.2 Gen1 Headers (19-pin USB32_4_5) (see p.7, No. 12) (19-pin USB32_6_7) (see p.7, No. 18)
There are two headers on this motherboard. Each USB 3.2 Gen1 header can support two ports.

USB32_4_5

Vbus

IntA_PB_SSRX-

IntA_PA_SSRX-

IntA_PB_SSRX+

IntA_PA_SSRX+

GND

IntA_PB_SSTX-

IntA_PA_SSTX-

IntA_PB_SSTX+

IntA_PA_SSTX+

GND

IntA_PB_D-

IntA_PA_D-

IntA_PB_D+

IntA_PA_D+

Dummy

1 TB 1

USB32_6_7
IntA_P_D+ IntA_P_DGND IntA_P_SSTX+ IntA_P_SSTXGND IntA_P_SSRX+ IntA_P_SSRXVbus
1
Vbus IntA_P_SSRXIntA_P_SSRX+ GND IntA_P_SSTXIntA_P_SSTX+ GND IntA_P_DIntA_P_D+ ID

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B850M Steel Legend WiFi
Front Panel Type C USB 3.2 Gen1 Header (20-pin USB32_TC2) (see p.7, No. 9) There is one Front Panel Type C USB 3.2 Gen1 Header on this motherboard. This header is used for connecting a USB 3.2 Gen1 module for additional USB 3.2 Gen1 ports.
USB32_TC2

1 TB 1

USB Type-C Cable

Front Panel Audio Header (9-pin HD_AUDIO1) (see p.7, No. 28) This header is for connecting audio devices to the front audio panel.
HD_AUDIO1
GND PRESENCE# MIC_RET OUT_RET
1 OUT2_L
J_SENSE OUT2_R MIC2_R MIC2_L
1 TB 1

High Definition Audio supports Jack Sensing, but the panel wire on the chassis must support HDA to function correctly. Please follow the instructions in our manual and chassis manual to install your system.
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Chassis Fan Connectors (4-pin CHA_FAN1) (see p.7, No. 25) (4-pin CHA_FAN2) (see p.7, No. 24) (4-pin CHA_FAN3) (see p.7, No. 21)
This header allows you to connect Case or Radiator fan. If you plan to connect a 3-pin fan, please connect it to Pin 1-3.

1 TB 1
CHA_FAN1
GND FAN_VOLTAGE CHA_FAN_SPEED FAN_SPEED_CONTROL
1 2 34

CHA_FAN3
GND FAN_VOLTAGE CHA_FAN_SPEED FAN_SPEED_CONTROL
1 2 34
CHA_FAN2
GND FAN_VOLTAGE CHA_FAN_SPEED FAN_SPEED_CONTROL
1 2 34

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B850M Steel Legend WiFi

CPU Fan Connector (4-pin CPU_FAN1) (see p.7, No. 3)
This header allows you to connect CPU fan. If you plan to connect a 3-pin fan, please connect it to Pin 1-3.

CPU_FAN1
4 3 21
GND +12V CPU_FAN_SPEED FAN_SPEED_CONTROL
1 TB 1

CPU Fan Connector (4-pin CPU_FAN2) (see p.7, No. 29)
This header allows you to connect CPU fan or Water Pump. If you plan to connect a 3-pin fan, please connect it to Pin 1-3.

CPU_FAN2

GND

FAN_VOLTAGE

CPU_FAN_SPEED

FAN_SPEED_CONTROL

1 TB 1

English

ATX Power Connector (24-pin ATXPWR1) (see p.7, No. 8)
This motherboard provides a 24-pin ATX power connector. To use a 20-pin ATX power supply, please plug it along Pin 1 and Pin 13.

ATXPWR1

1 TB 1

ATX 12V Power Connector (8-pin ATX12V1) (see p.7, No. 1)
This motherboard provides a 8-pin ATX 12V power connector. To use a 4-pin ATX power supply, please plug it along Pin 1 and Pin 5. *Warning: Please make sure that the power cable connected is for the CPU and not the graphics card. Do not plug the PCIe power cable to this connector.

ATX12V1

1 TB 1

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B850M Steel Legend WiFi
ATX 12V Power Connector (4-pin ATX12V2) (see p.7, No. 2) Please connect an ATX 12V power supply to this connector. *The power supply plug fits into this connector in only one orientation. *Connecting an ATX 12V 4-pin cable to ATX12V2 is optional. *For advanced overclocking we suggest using this connector together with ATX12V1.
ATX12V2
1 TB 1
SPI TPM Header (13-pin SPI_TPM_J1) (see p.7, No. 13) This connector supports SPI Trusted Platform Module (TPM) system, which can securely store keys, digital certificates, passwords, and data. A TPM system also helps enhance network security, protects digital identities, and ensures platform integrity.
SPI_TPM_J1
SPI_DQ3 SPI_PWR Dummy CLK SPI_MOSI RST# TPM_PIRQ
1 SPI_TPM_CS#
GND RSMRST# SPI_MISO SPI_CS0 SPI_DQ2
1 TB 1
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Thermistor Cable Header (2-pin T_SENSOR1) (see p.7, No. 20) The Thermistor Cable Headers are used to connect thermistor cables to monitor the temperature of the critical components. Plug the thermistor cable that comes with the package to this header, and then attach the sensor end to the component to detect the temperature.
T_SENSOR1
1 GND
SENSOR IN
1 TB 1
Connect your Thermistor Cable to the Thermistor Cable Header (T_SENSOR1) on the motherboard.
T_SENSOR
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B850M Steel Legend WiFi
RGB LED Header (4-pin RGB_LED1) (see p.7, No. 7) This RGB header is used to connect RGB LED extension cable which allow users to choose from various LED lighting effects. Caution: Never install the RGB LED cable in the wrong orientation; otherwise, the cable may be damaged.

RGB_LED1
B R G +12V 1
1 TB 1
Connect your RGB LED strip to the RGB LED Header (RGB_LED1) on the motherboard.

12V G R

1. Never install the RGB LED cable in the wrong orientation; otherwise, the cable may be damaged.
2. Before installing or removing your RGB LED cable, please power off your system and unplug the power cord from the power supply. Failure to do so may cause damages to motherboard components.

1. Please note that the RGB LED strips do not come with the package. 2. The RGB LED header supports standard 5050 RGB LED strip (12V/G/R/B), with a
maximum power rating of 3A (12V) and length within 2 meters.

English

Addressable LED Headers (3-pin ADDR_LED1) (see p.7, No. 26) (3-pin ADDR_LED2) (see p.7, No. 27) (3-pin ADDR_LED3) (see p.7, No. 6) These headers are used to connect Addressable LED extension cables which allow users to choose from various LED lighting effects. Caution: Never install the Addressable LED cable in the wrong orientation; otherwise, the cable may be damaged.
ADDR_LED3

ADDR_LED1

GND DO_ADDR

1 TB 1

VOUT

Connect your Addressable RGB LED strips to the Addressable LED Headers (ADDR_ LED1 / ADDR_LED2 / ADDR_LED3) on the motherboard.

ADDR_LED2
1 GND
DO_ADDR VOUT
1

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B850M Steel Legend WiFi
1. Never install the Addressable LED cable in the wrong orientation; otherwise, the cable may be damaged.
2. Before installing or removing your Addressable LED cable, please power off your system and unplug the power cord from the power supply. Failure to do so may cause damages to motherboard components. 1. Please note that the Addressable LED strips do not come with the package. 2. The Addressable LED header supports WS2812B addressable RGB LED strip (5V/ Data/GND), with a maximum power rating of 3A (5V) and length within 2 meters.
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2.13 Smart Button
The motherboard has a smart button: BIOS Flashback Button, allowing users to flash the BIOS. BIOS Flashback Button (BIOS_FB1) (see p.9, No. 10) BIOS Flashback Button allows users to flash the BIOS.
BIOS_FB1
1 TB 1
USB BIOS Flashback port
52

English

B850M Steel Legend WiFi
ASRock BIOS Flashback feature allows you to update BIOS without powering on the system, even without CPU.
Before using the BIOS Flashback function, please suspend BitLocker and any encryption or security relying on the TPM. Make sure that you have already stored and backup-ed the recovery key. If the recovery key is missing while encryption is active, the data will stay encrypted and the system will not boot into the operating system. It is recommended to disable fTPM before updating the BIOS. Otherwise an unpredictable failure may occur.
To use the USB BIOS Flashback function, Please follow the steps below. 1. Download the latest BIOS file from ASRock's website : http://www.asrock.com. 2. Copy the BIOS file to your USB flash drive. Please make sure the file system of
your USB flash drive must be FAT32. 3. Extract BIOS file from the zip file. 4. Rename the file to "creative.rom" and save it to the root directory of X: USB flash drive. 5. Plug the 24 pin power connector to the motherboard. Then turn on the power supply's AC
switch. *There is no need to power on the system. 6. Then plug your USB drive to the USB BIOS Flashback port. 7. Press the BIOS Flashback Switch for about three seconds. Then the LED starts to blink. 8. Wait until the LED stops blinking, indicating that BIOS flashing has been completed. *If the LED light turns solid green, this means that the BIOS Flashback is not operating properly. Please make sure that you plug the USB drive to the USB BIOS Flashback port. **If the LED does not light up at all then please disconnect power from the system and remove/disconnect the CMOS battery from the motherboard for several minutes. Reconnect power and battery and try again.
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2.14 Post Status Checker
Post Status Checker (PSC) diagnoses the computer when users power on the machine. The LEDs light up to show what component is running into an issue. They emit red, yellow, white and yellow-green lights to indicate, respectively, the CPU, memory, VGA and storage are not detected or fail. They will remain lit until the issue is fixed. The lights go off if the four mentioned above are functioning normally.

Component
CPU DRAM VGA BOOT

LED Indicator
Solid Red Solid Yellow Solid White Solid Yellow-Green

Status
indicates CPU is dysfunctional. indicates DRAM is dysfunctional. indicates GPU is dysfunctional. indicates boot device is dysfunctional.

1 TB 1
It is normal for the DRAM status LED to blink during memory training. This indicates the system is working properly.
Tutorial Video
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B850M Steel Legend WiFi

2.15 M.2 SSD Installation Guide (M2_1)
The M.2 is a small size and versatile card edge connector that aims to replace mPCIe and mSATA. The Blazing M.2 Socket (M2_1, Key M) supports type 2280 PCIe Gen5x4 (128 Gb/s) mode. * M2_1 is the first priority for M.2 installation. * M2_1 will run at Gen5x4 with 9000 and 7000 series processors, Gen4x4 with 8000 (Phoenix 1) series processors and Gen4x2 with 8000 (Phoenix 2) series processors.

Installing the M.2 SSD

Step 1 Prepare a M.2 SSD.

Step 2
Depending on the PCB type and length of your M.2 SSD, find the corresponding nut location to be used.

No. Nut Location PCB Length Module Type

1 A 8cm Type 2280

English

2 1

Step 3 1
Before installing a M.2 SSD, please loosen the screws to remove the M.2 heatsink. *Please remove the protective films on the bottom side of the M.2 heatsink before you install a M.2 SSD.
Step 4
Align and gently insert the M.2 SSD into the M.2 slot. Please be aware that the M.2 SSD only fits in one orientation.

20o

English

1 2

B850M Steel Legend WiFi

Step 5

Tighten the screws with a screwdriver

to secure the M.2 SSD and M.2

heatsink into place in the order

shown. Tighten screw opposite the

M.2 connector first (2), and then

tighten the one next to the M.2

connector (3).

*Please do not overtighten the screw

as this might damage the M.2 SSD

and M.2 heatsink.

For the latest updates of M.2 SSD module support list, please visit our website for details: http://www.asrock.com

English

2.16 M.2 SSD Installation Guide (M2_2)
The M.2 is a small size and versatile card edge connector that aims to replace mPCIe and mSATA. The M.2 Socket (M2_2, Key M), supports type 2260/2280 PCIe Gen4x2 (32 Gb/s) mode.

Installing the M.2 SSD

Step 1 Prepare a M.2 SSD.

Step 2

Depending on the PCB type and

length of your M.2 SSD, find the

corresponding nut location to be

used.

No. Nut Location PCB Length Module Type

1 A 6cm Type 2260

2 B 8cm Type 2280

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B850M Steel Legend WiFi
Step 3 Use a screwdriver to remove the standoff. Skip Step 3 if your M.2 SSD is Type 2280.
Step 4 Peel off the yellow protective film on the nut to be used. Tighten the standoff into the desired nut location on the motherboard with a screwdriver. Skip Step 4 if your M.2 SSD is Type 2280.
Step 5 Align and gently insert the M.2 SSD into the M.2 slot. Please be aware that the M.2 SSD only fits in one orientation.

English

20o
59

Step 6 Ensure that the notch at the end of the M.2 SSD aligns with the nut. Then secure the M.2 SSD by turning the nut lock clockwise to its locked position. For the latest updates of M.2 SSD support list, please visit our website for details: http:// www.asrock.com
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B850M Steel Legend WiFi

2.17 M.2 SSD Installation Guide (M2_3)
The M.2 is a small size and versatile card edge connector that aims to replace mPCIe and mSATA. The Hyper M.2 Socket (M2_3, Key M), supports type 2260/2280 PCIe Gen4x4 (64 Gb/s) mode.

Installing the M.2 SSD

Step 1 Prepare a M.2 SSD.

Step 2

Depending on the PCB type and

length of your M.2 SSD, find the

corresponding nut location to be

used.

No. Nut Location PCB Length Module Type

1 A 6cm Type 2260

2 B 8cm Type 2280

English

2 1

1
Step 3
Before installing a M.2 SSD, please loosen the screws to remove the M.2 heatsink. *Please remove the protective films on the bottom side of the M.2 heatsink before you install a M.2 SSD.
Step 4
Peel off the yellow protective film on the nut to be used. Hand tighten the standoff (in the package) into the desired nut location on the motherboard. Skip Step 4 if your M.2 SSD is Type 2280.
Step 5
Align and gently insert the M.2 SSD into the M.2 slot. Please be aware that the M.2 SSD only fits in one orientation.

English

20o
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B850M Steel Legend WiFi

NUT2

NUT1

Step 6
Tighten the screw with a screwdriver to secure the M.2 SSD into place. Please do not overtighten the screw as this might damage the M.2 SSD. Skip Step 6 if your M.2 SSD is Type 2280.
Step 7
Ensure that the notch at the end of the M.2 SSD aligns with the nut. Then secure the M.2 SSD by turning the nut lock clockwise to its locked position. Skip Step 7 if your M.2 SSD is Type 2260.

1 2

3 Step 8
Tighten the screws with a screwdriver to secure the M.2 SSD and M.2 heatsink into place in the order shown. Tighten screw opposite the M.2 connector first (2), and then tighten the one next to the M.2 connector (3). *Please do not overtighten the screw as this might damage the M.2 SSD and M.2 heatsink.

For the latest updates of M.2 SSD support list, please visit our website for details: http:// www.asrock.com

English

Version 1.0 Published December 2024
Copyright©2024 ASRock INC. All rights reserved.
Copyright Notice:
No part of this documentation may be reproduced, transcribed, transmitted, or translated in any language, in any form or by any means, except duplication of documentation by the purchaser for backup purpose, without written consent of ASRock Inc.
Products and corporate names appearing in this documentation may or may not be registered trademarks or copyrights of their respective companies, and are used only for identification or explanation and to the owners' benefit, without intent to infringe.
Disclaimer:
Specifications and information contained in this documentation are furnished for informational use only and subject to change without notice, and should not be constructed as a commitment by ASRock. ASRock assumes no responsibility for any errors or omissions that may appear in this documentation.
To the extent permitted by law, with respect to the contents of this documentation, ASRock does not provide warranty of any kind, either expressed or implied, including but not limited to the implied warranties or conditions of merchantability or fitness for a particular purpose. In no event shall ASRock, its directors, officers, employees, or agents be liable for any indirect, special, incidental, or consequential damages (including damages for loss of profits, loss of business, loss of data, interruption of business and the like), even if ASRock has been advised of the possibility of such damages arising from any defect or error in the documentation or product.

FCC Compliance Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that
may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: - Reorient or relocate the receiving antenna. - Increase the separation between the equipment and receiver. - Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected. - Consult the dealer or an experienced radio/TV technician for help.
Button Battery Safety Notice
WARNING
· INGESTION HAZARD: This product contains a button cell or coin battery.
· DEATH or serious injury can occur if ingested. · A swallowed button cell or coin battery can cause Internal
Chemical Burns in as little as 2 hours. · KEEP new and used batteries OUT OF REACH of CHILDREN · Seek immediate medical attention if a battery is suspected to
be swallowed or inserted inside any part of the body.
- Remove and immediately recycle or dispose of used batteries according to local regulations and keep away from children. Do NOT dispose of batteries in household trash or incinerate.
- Even used batteries may cause severe injury or death. - Call a local poison control center for treatment information. - Battery type: CR2032 - Battery voltage: 3V - Non-rechargeable batteries are not to be recharged. - Do not force discharge, recharge, disassemble, heat above (manufacturer's specified
temperature rating) or incinerate. Doing so may result in injury due to venting, leakage or explosion resulting in chemical burns. - This product contains an irreplaceable battery. - This icon indicates that a swallowed button battery can cause serious injury or death. Please keep batteries out of sight or reach of children.

CALIFORNIA, USA ONLY
The Lithium battery adopted on this motherboard contains Perchlorate, a toxic substance controlled in Perchlorate Best Management Practices (BMP) regulations passed by the California Legislature. When you discard the Lithium battery in California, USA, please follow the related regulations in advance. "Perchlorate Material-special handling may apply, see www.dtsc.ca.gov/hazardouswaste/ perchlorate"
CALIFORNIA, USA ONLY
WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
CE Conformity
ASRock INC. hereby declares that this device is in compliance with the essential requirements and other relevant provisions of related Directives. Full text of EU declaration of conformity is available at: http://www.asrock.com ASRock follows the green design concept to design and manufacture our products, and makes sure that each stage of the product life cycle of ASRock product is in line with global environmental regulations. In addition, ASRock disclose the relevant information based on regulation requirements. Please refer to https://www.asrock.com/general/about.asp?cat=Responsibility for information disclosure based on regulation requirements ASRock is complied with.
UKCA Conformity
ASRock INC. hereby declares that this device is in compliance with the essential requirements and other relevant provisions of related UKCA Directives. Full text of UKCA declaration of conformity is available at: http://www.asrock.com

Consumer Limited Warranty - Australia
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage caused by our goods. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure. If you require assistance please call ASRock Tel : +886-2-28965588 ext.123 (Standard International call charges apply)
WARNING
THIS PRODUCT CONTAINS A BUTTOON BATTERY If swallowed, a button battery can cause serious injury or death. Please keep batteries out of sight or reach of children.
Proper Disposal
DO NOT throw the motherboard in municipal waste. This product has been designed to enable proper reuse of parts and recycling. This symbol of the crossed out wheeled bin indicates that the product (electrical and electronic equipment) should not be placed in municipal waste. Check local regulations for disposal of electronic products.
Class B ITE

Trademark Information
The terms HDMI® and HDMI High-Definition Multimedia Interface, and the HDMI logo are trademarks or registered trademarks of HDMI Licensing LLC in the United States and other countries.

European Community Radio Equipment Directive Compliance Statement
This device complies with directive 2014/53/EU issued by the Commision of the European Community. This equipment complies with EU radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. Operations in the 5.15-5.35/6GHz band are restricted to indoor usage only.
Radio Frequency Bands and Maximum Power Levels · Features : Wi-Fi 6E, BT, Wi-Fi 7 · Frequency Range : 2.4 GHz: 2400-2485MHz; 5 GHz: 5150-5350MHz, 5470-5725MHz,
5725-5850MHz; 6 GHz: 5955-6415MHz · Max Power Level : 2.4 GHz: 20dBm; 5 GHz: 23dBm; 6 GHz: 23dBm
Compliance Statement of Innovation, Science and Economic Development Canada (ISED)
This device complies with with Innovation, Science and Economic Development Canada's licence-exempt RSS(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Operation in the band 5150-5250 MHz is only for indoor use to reduce the potential for harmful interference to co-channel mobile satellite systems. CAN ICES-003(B)/NMB-003(B)
NCC

References

Adobe PDF Library 17.0 Adobe InDesign 20.0 (Windows)