1. Introduction
This manual provides detailed instructions for the installation, configuration, and operation of your MAXSUN MS-eSport B850ITX WIFI ICE Motherboard. Designed for AMD Ryzen AM5 processors, this Mini-ITX motherboard offers robust performance with DDR5 memory support, PCIe 5.0, integrated Wi-Fi 6, and Bluetooth 5.2. Please read this manual thoroughly before proceeding with installation to ensure proper setup and to maximize the performance and longevity of your system.
2. Safety Information
Always observe the following safety precautions when handling and installing the motherboard:
- Disconnect the power cord from the wall outlet before touching any component.
- Wear an anti-static wrist strap or frequently touch a grounded object (e.g., the metal chassis) to discharge static electricity.
- Handle the motherboard by its edges to avoid touching sensitive components.
- Keep the motherboard away from moisture and extreme temperatures.
- Ensure proper ventilation within your PC case to prevent overheating.
- Do not attempt to repair the motherboard yourself. Refer to qualified service personnel.
3. Package Contents
Verify that all items are present in your motherboard package:
- MAXSUN MS-eSport B850ITX WIFI ICE Motherboard
- Wi-Fi Antenna(s)
- SATA Data Cable(s)
- User Manual (this document)
- I/O Shield (if not pre-installed)
- M.2 SSD Screws/Standoffs

4. Technical Specifications
| Feature | Specification |
|---|---|
| Form Factor | Mini-ITX (170mm x 170mm) |
| CPU Socket | AMD AM5 Socket |
| CPU Compatibility | AMD Ryzen 7000/8000/9000 Series Processors |
| Chipset | AMD B850 |
| Memory Slots | 2 x U-DIMM DDR5 |
| Max. RAM Capacity | 96GB |
| Memory Type Support | DDR5 4800/5200/5600-8000 (OC+) MHz, Dual Channel |
| Graphics Output | 1 x HDMI 1.4 (Max. 4096x2160@30Hz), 1 x DisplayPort (DP) (Max. 4096x2160@60Hz) |
| Expansion Slots | 1 x PCI Express 5.0 x16 |
| Storage Interfaces | 2 x SATA 3.0, 2 x M.2 slots (PCIe 4.0 x4/x2, supports 2242/2280 SSDs) |
| Audio | Integrated REALTEK ALC897 Audio Chip, 3 rear audio ports (Line In, Line Out, Mic In) |
| LAN | Integrated REALTEK8125BG/D (10/100/1000/2500Mbit) 1x RJ45 |
| Wireless Connectivity | Wi-Fi 6 (AX), Bluetooth 5.2 (Integrated Realtek 8852) |
| USB Ports (Rear) | 2 x USB 3.2 Gen1, 4 x USB 2.0 |
| Internal USB Headers | 1 x USB 2.0 (9-pin), 1 x USB 3.2 Gen1 (16-pin), 1 x USB Type-C (10Gbps) |
| Power Connectors | 1 x 24-pin ATX, 1 x 8-pin ATX 12V |
| Fan Headers | 1 x CPU Fan, 1 x System Fan |
| RGB Headers | 2 x 5V ARGB (3-pin), 1 x 12V NRGB (4-pin) |
| Other Connectors | Front Panel Audio, Front Panel USB, TPM, COM_A |
| ESD Protection | Air discharge ±8KV Class C, ±6KV Class B; Contact discharge ±6KV Class C, ±3KV Class B |
| Supported OS | Windows 10 64-bit, Windows 11 64-bit, Ubuntu 64-bit |
5. Motherboard Layout and I/O Panel
Familiarize yourself with the various components and connectors on your motherboard.


5.1. Rear I/O Panel Description
- A: DisplayPort (DP) Interface: Supports up to 4096x2160@60Hz resolution, providing audio and video output.
- B: HDMI Port: Supports up to 4096x2160@30Hz resolution, providing audio and video output.
- C: Double-layer USB 2.0 Type-A Interfaces: Used for connecting USB 2.0 devices, backward compatible with USB 1.1.
- D: CLR_CMOS Button: One-key button to clear motherboard BIOS settings and restore default initialization settings.
- E: Double-layer USB 2.0 Type-A Interfaces: (Same as C)
- F: Double-layer USB 3.2 Gen1 Interfaces: Supports up to 5Gbps data transmission, compatible with USB 1.1 and USB 2.0 standards.
- G: RJ45 Network Cable Interface: Used for network connection, supporting up to 2500Mbps bandwidth.
- H: Wi-Fi Interface: Integrated Realtek 8852 WiFi6 wireless network card and Bluetooth 5.2. Requires correct driver installation for normal use.
- I: Audio-in Interface (Blue): For audio input devices like mobile phone audio input.
- Audio-out Interface (Light Green): For audio output devices like headphones, speakers.
- Microphone Interface (Pink): For microphone input devices.
RJ45 Network Port LED Indicators:
| Activity Link LED Status | Description | Speed LED Status | Description |
|---|---|---|---|
| Off | No link | Off | 10Mbps connection |
| Yellow | Linked | Green | 100Mbps connection |
| Blinking | Data activity | Orange | 1000Mbps/2.5Gbps connection |
6. Hardware Installation
Follow these steps to install the components onto your motherboard. Ensure your system is powered off and unplugged before beginning.
6.1. CPU Installation
- Locate the AM5 CPU socket on the motherboard.
- Open the CPU socket retention mechanism.
- Carefully align the CPU with the socket, ensuring the triangular mark on the CPU matches the mark on the socket. Do not force the CPU into place.
- Close the retention mechanism to secure the CPU.
6.2. Memory (RAM) Installation
- Locate the two DDR5 DIMM slots.
- Open the clips at both ends of the memory slot.
- Align the notch on the DDR5 memory module with the key in the DIMM slot.
- Insert the memory module firmly into the slot until the clips snap into place.
6.3. Storage Device Installation
M.2 SSD Installation:
- Identify the M.2 slots (one on the front, one on the back of the PCB).
- Remove the M.2 standoff screw from the desired slot.
- Insert the M.2 SSD into the slot at a slight angle.
- Gently push down the SSD and secure it with the standoff screw.
SATA Drive Installation:
- Connect one end of the SATA data cable to a SATA 3.0 port on the motherboard.
- Connect the other end of the SATA data cable to your SATA HDD/SSD.
- Connect a SATA power cable from your power supply to the SATA HDD/SSD.
6.4. Expansion Card Installation (PCIe)
- Locate the PCIe 5.0 x16 slot.
- Remove the corresponding slot cover from your PC case.
- Align your graphics card or other PCIe expansion card with the slot.
- Press down firmly until the card is seated correctly and the retention clip engages.
- Secure the card to the case with a screw.
6.5. Power Supply Connections
- Connect the 24-pin ATX power connector from your power supply to the main 24-pin power socket on the motherboard.
- Connect the 8-pin ATX 12V power connector from your power supply to the 8-pin power socket near the CPU.
6.6. Front Panel and Other Connectors
Connect your PC case's front panel cables (power button, reset button, USB ports, audio jacks, etc.) to the corresponding headers on the motherboard. Refer to the motherboard layout diagram for exact locations.
- F_PANEL: Chassis front control panel headers.
- USB Headers: Connect front panel USB 2.0, USB 3.2 Gen1, and USB Type-C cables.
- F_AUDIO Header: Connect front panel audio cables.
- ARGB/NRGB Headers: Connect compatible RGB lighting strips or fans.
- Fan Headers: Connect CPU fan and system fans.

7. Operating Instructions
7.1. Initial Boot-up
- After all components are installed and connected, close your PC case.
- Connect your monitor, keyboard, and mouse.
- Plug in the power cord and turn on the power supply.
- Press the power button on your PC case.
7.2. BIOS Setup
Upon initial boot, you may need to enter the BIOS (Basic Input/Output System) to configure settings or install an operating system.
- To enter BIOS Setup, press the DEL key repeatedly during the boot process.
- The BIOS interface is available in English.
- Navigate using your keyboard (arrow keys, Enter, Esc) or mouse.
- Configure boot order, enable/disable features, and adjust performance settings as needed.
- Save changes and exit BIOS to continue booting.

7.3. Operating System Installation
Insert your Windows 10/11 or Ubuntu installation media (USB drive or DVD) and follow the on-screen prompts to install your preferred operating system.
8. Maintenance
8.1. Keeping Drivers Up-to-Date
For optimal performance and stability, regularly download and install the latest drivers for your motherboard components (chipset, audio, LAN, Wi-Fi, Bluetooth) from the official MAXSUN website. This is especially important for activating all functions.
8.2. BIOS Updates
BIOS updates can improve system stability, compatibility, and performance. It is highly recommended to carefully read the instructions provided on the MAXSUN website for updating the BIOS. Incorrect procedures can lead to system instability.
8.3. Cleaning
Periodically clean your motherboard and PC case to prevent dust buildup, which can lead to overheating. Use compressed air to remove dust from fans, heatsinks, and other components. Ensure the system is powered off and unplugged before cleaning.
9. Troubleshooting
- System Fails to Boot: Double-check all power connections (24-pin ATX, 8-pin CPU), ensure RAM modules are properly seated, and verify the CPU is correctly installed.
- BIOS Issues / Corrupted BIOS: If you encounter messages like "New CPU installed, TPM/PSP NV corrupted or fTPM/PSP NV structure changed," or if the system is unstable after changes, use the CLR_CMOS button on the rear I/O panel to reset BIOS settings to default.
- No Display: Ensure your monitor is connected to the correct graphics output (either motherboard's HDMI/DP or discrete graphics card). Reseat your graphics card if applicable.
- Wi-Fi/Bluetooth Not Working: Ensure you have installed the correct drivers from the MAXSUN website. Check that the Wi-Fi antenna(s) are securely connected.
- Overheating: Verify all fans (CPU, case) are spinning correctly and that heatsinks are free of dust. Ensure proper airflow within the case.
10. User Tips
- Always download the latest drivers from the official MAXSUN website to ensure all motherboard functions are active and optimized.
- When updating the BIOS, follow the instructions carefully. While the process is generally straightforward, attention to detail is crucial.
- The BIOS interface is in English, making navigation and configuration accessible.
- Be aware that the M.2 slot on this motherboard does not include a dedicated heatsink. Consider aftermarket M.2 heatsinks for high-performance SSDs to prevent thermal throttling.
- For users accustomed to major brand motherboards, the BIOS setup and update methods might feel slightly different, but they are functional and reliable once understood.
11. Warranty and Support
For detailed warranty information, terms, and conditions, please refer to the official documentation provided with your product or visit the MAXSUN official website. For technical support, driver downloads, and further assistance, please visit the MAXSUN support page.
A comprehensive user manual in PDF format is also available for download: View User Manual (PDF)