MSI MPG GUNGNIR 300R AIRFLOW MPG Series PC Case Instructions

Product Name	MPG GUNGNIR 300R AIRFLOW	MPG GUNGNIR 300R AIRFLOW WHITE	MPG GUNGNIR 300P AIRFLOW	MPG GUNGNIR 300P AIRFLOW LITE
Color	Black	White	Black	Black
Fan Configuration	Front: 3 x 120mm PWM ARGB Fans Rear: 1 x 120mm PWM ARGB Fan	Front: 3 x 120mm PWM ARGB Fans Rear: 1 x 120mm PWM ARGB Fan	Front: 3 x 120mm PWM Fans (non-ARGB) Rear: 1 x 120mm PWM Fan (non-ARGB)	Front: 3 x 120mm PWM Fans (non-ARGB) Rear: 1 x 120mm PWM Fan (non-ARGB)
LED Switch Button	Yes	Yes	No	No
Horizontal GPU Bracket	Pre-installed	Pre-installed	Included in accessory box	Included in accessory box
Vertical GPU Bracket	Included in accessory box	Included in accessory box	Pre-installed	Pre-installed
PCIe4.0x16 Riser Cable	Not included	Not included	Pre-installed	Not included

Basic Information

Case Type	Mid Tower
Dimensions (DxWxH)	505 x 235 x 510mm
Supported Motherboard Sizes	EATX, ATX, Micro-ATX, Mini-ITX EATX up to 280 x 305mm (12”x10.9”)

Cooling Fan Support

Top	3 x 120mm or 2 x 140mm
Front	3 x 120mm or 3 x 140mm
Rear	1 x 120 / 140mm
PSU Shroud	2 x 120mm
Cable Cover	1 x 80mm* / 1 x 120mm * Pre-installed with an 80 mm fan in the 300P series.
Vertical GPU Bracket	2 x 60mm (thickness: 15mm) pre-installed in the 300P series.

Expansion Slots

Horizontal GPU Bracket	7 slots
Vertical GPU Bracket	4 slots & equipped with 2 x 6015 fans* * 6015 fans are optional for 300R and pre-installed for 300P.

Drive Bays

2.5″ SSD	4 (up to 8)* * Only supports up to 7 when using EATX motherboard
Combo 3.5″/2.5″	2

I/O Ports and Buttons

USB Ports	2 x USB 3.2 Gen1 Type-A, 1 x USB 3.2 Gen2x2 Type-C
Audio Ports	1 x Audio jack, 1 x Micphone jack
Buttons	1 x Reset button, 1 x Power button, 1 x LED switch button (300R)

Chassis Clearances

Maximum CPU Cooler Height	175mm
Maximum GPU Length	300R series: 360mm (GPU holder installed at right front) 340mm (GPU holder installed at right rear)300P series: 338mm* (GPU holder installed at right front or right rear)* After removing the pre-installed 80mm fan, the maximum GPU length of the 300P series is the same as that of the 300R series
Maximum GPU Width	142mm (Horizontal installed) 150mm (Vertical installed)
Maximum GPU Thickness	80mm
Radiator Support	Front: 360mm, Top: 360mm, Rear: 140mm
PSU Support	Above 220mm

Materials

Steel Thickness	0.8mm
Tempered Glass	3mm
Front Bezel*	Perforated Metal Mesh + ABS * Removable for easy cleaning, with Ø1mm mesh holes that do not require a dust filter.
Top Bezel**	Metal ** Non-removable for airflow optimization
Dust Filter	Top: Magnetic filter Side: Magnetic filter Bottom: Plastic pull-out filter

Accessories (300R)

Item	Name / Q’ty	Used for
	Cable ties x10	Cable management
	L-shaped Screwdriver x1	Securing vertical graphics card & bracket
	Screw M3 5mm x35	Motherboard / SSD / PCIe riser cable
	Screw #6-32 6mm x4	Securing PSU
	Screw #6-32 6mm x4	Securing HDD
	Screw #6-32 7.5mm x8	Securing liquid cooling radiator
	Screw #6-32 30mm x12	Securing liquid cooling radiator fan
	Stand-off #6-32 6.5mm x2	PCIe riser cable stand
	Stand-off Mounting Tool x 1	Securing motherboard / PCIe riser cable
	Vertical graphics card bracket x1	Securing vertical graphics card
	80mm/120mm fan mounting kit x1 (Bracket x1, Screw Ø5 8mm x4, Screw Ø9.5 14.5mm x2)	Securing 80mm/120mm fan

Accessories (300P)

Item	Name / Q’ty	Used for
	Cable ties x10	Cable management
	L-shaped Screwdriver x1	Securing vertical graphics card & bracket
	Screw M3 5mm x35	Motherboard / SSD / PCIe riser cable
	Screw #6-32 6mm x4	Securing PSU
	Screw #6-32 6mm x4	Securing HDD
	Screw #6-32 7.5mm x8	Securing liquid cooling radiator
	Screw #6-32 30mm x12	Securing liquid cooling radiator fan
	Stand-off Mounting Tool x 1	Securing motherboard / PCIe riser cable
	Horizontal graphics card bracket x1	Securing horizontal graphics card
	Screw Ø5 8mm x2	Securing 80mm/120mm fan

Case Features (300R)

Case Features (300P)

MPG GUNGNIR 300P AIRFLOW LITE does not include this accessory

Side and Front View

I/O and Buttons

Item	Description
1	USB 3.2 Gen 1 5Gbps Type-A port
2	USB 3.2 Gen 2 10Gbps Type-C port
3	Microphone jack
4	Audio jack
5	LED switch button (only available on 300R series)
6	Reset button
7	Power button

Side Panel Removal

Front Bezel Removal

GPU Holder Removal

Cable Cover Removal

Motherboard Installation

Horizontal Graphics Card Installation

Vertical Graphics Card Installation (1)

Vertical Graphics Card Installation (2)

SSD Installation

HDD Installation

PSU Installation

Top Panel I/O Connection

Control Board Connection

ARGB LED

ARGB connector
Motherboard ARGB and fan connectors

Fan
Power supply’s SATA connector

LED Switch button

Addressable RGB LED Strip Connection

ARGB connector
ARGB extension cable
ARGB strip

Addressable RGB LED Fan Connection

ARGB connector
Fan connector
ARGB Fan

ARGB
RGB

IMPORTANT

Please always turn off the power supply and unplug the power cord from the power outlet before installing or removing the ARGB LED Strip.
Supports a maximum of 156 LEDs. Exceeding this limit may result in overheating, abnormal colors, or malfunctions.
Only compatible with 4-pin PWM fans.
Please ensure all cables are securely connected before powering on.

LED Effect Sequence

After pressing the LED Switch button, the LED effect sequence is as follows:

1	Solid red
2	Solid blue
3	Solid yellow
4	Solid green
5	Solid cyan
6	Solid orange
7	Solid purple
8	Solid white
9	8-color running effect (red, blue, yellow, green, cyan, orange, purple, white)
10	8-color breathing transition effect (red, blue, yellow, green, cyan, orange, purple, white)
11	8-color flowing effect (red, blue, yellow, green, cyan, orange, purple, white)
12	Green fading
13	Blue fading
14	Red fading
15	Dual-color running effect (red-blue, blue-yellow, yellow-green, green-cyan, cyan-orange, orange-purple, purple-white, white-red)
16	Rainbow color cycling (Default)

Graphics Card Limitation

Horizontal GPU and GPU holder at right front Installation

GPU Length:
• Maximum up to 360mm (300R)
• Maximum up to 338mm (300P)
GPU Width (Horizontal): Maximum up to 142mm

GPU Thickness: Maximum up to 80mm

Vertical GPU and GPU holder at right front Installation

GPU Length:
• Maximum up to 360mm (300R)
• Maximum up to 338mm (300P)
GPU Width (Vertical): Maximum up to 150mm
GPU Thickness: Maximum up to 80mm

Horizontal GPU and GPU holder at right rear Installation

GPU Length:
• Maximum up to 340mm (300R)
• Maximum up to 338mm (300P)

GPU Width (Horizontal): Maximum up to 142mm
GPU Thickness: Maximum up to 80mm

Vertical GPU and GPU holder at right rear Installation

GPU Length:
• Maximum up to 340mm (300R)
• Maximum up to 338mm (300P)
GPU Width (Vertical): Maximum up to 150mm

GPU Thickness: Maximum up to 80mm

GPU Holder Installation

GPU Holder Position

GPU Holder Position	Maximum GPU Length
Position 1	Less than 340mm
Position 2	Less than 330mm
Position 3	Less than 310mm
Position 4	Less than 290mm
Position 5	Less than 265mm

GPU Holder Adjustment

GPU Support Arm Removal

Fan Compatibility and Setup

Radiator Compatibility and Setup

360mm Radiator Configuration Push-Pull Radiator Configuration

General Information

Copyright and Trademarks Notice

The MSI logo used is a registered trademark of Micro-Star Int’l Co., Ltd. All other marks and names mentioned may be trademarks of their respective owners. No warranty as to accuracy or completeness is expressed or implied. MSI reserves the right to make changes to this document without prior notice.

All text, images, illustrations, and other content in this manual are the property of MSI. No part of this manual may be reproduced, distributed, or used in any form without the written permission of MSI.

Revision History

Version 1.0, 2023/07, First release.

Documents / Resources

MSI MPG GUNGNIR 300R AIRFLOW MPG Series PC Case [pdf] Instructions
MPG GUNGNIR 300R AIRFLOW MPG Series PC Case, MPG GUNGNIR, 300R AIRFLOW MPG Series PC Case, MPG Series PC Case, PC Case, Case

References

User Manual

MPG Series

PC Case

Specifications

Comparison of Key Differences