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MSI MAG B550M MORTAR MAX WIFI DDR4 AM4 AMD B550 SATA 6Gb/s Micro-ATX Wi-Fi 6E 2.5Gbps LAN M.2 (Key-E) Motherboards - AMD

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Extended Heatsink Design: MSI extended PWM heatsink and enhanced circuit design ensures even high-end processors to run in full speed.
Wi-Fi 6E: The latest wireless solution supports 6GHz spectrum, MU-MIMO and BSS color technology, delivering speeds up to 2400Mbps.
M.2 Shield FROZR: M.2 thermal accessory keeps M.2 SSDs safe while preventing throttling, making them run faster.
Core Boost: With premium layout and fully digital power design to support
more cores and provide better performance.
Lightning Gen4 Solution: The latest Gen4 PCI-E and M.2 solution with up to 64GB/s bandwidth for maximum transfer speed.
2.5G Network Solution: Featuring premium 2.5G LAN to deliver better network
experience.
Audio Boost: Reward your ears with studio grade sound quality for the most
immersive audio experience.
DDR4 Boost: Advanced technology to deliver pure data signals for the best
gaming performance and stability.
2oz Thickened Copper PCB: An enhanced PCB design

Overview

Specs

Reviews

Extended Heatsink Design: MSI extended PWM heatsink and enhanced circuit design ensures even high-end processors to run in full speed.
Wi-Fi 6E: The latest wireless solution supports 6GHz spectrum, MU-MIMO and BSS color technology, delivering speeds up to 2400Mbps.
M. 2
Shield FROZR: M. 2 thermal accessory keeps M. 2 SSDs safe while preventing throttling, making them run faster.
Core Boost: With premium layout and fully digital power design to support
more cores and provide better performance.
Lightning Gen4 Solution: The latest Gen4 PCI-E and M. 2 solution with up to 64GB/s bandwidth for maximum transfer speed.
2.5G Network Solution: Featuring premium 2.5G LAN to deliver better network
experience.
Audio Boost: Reward your ears with studio grade sound quality for the most
immersive audio experience.
DDR4 Boost: Advanced technology to deliver pure data signals for the best
gaming performance and stability.
2oz Thickened Copper PCB: An enhanced PCB design

Model
Brand	MSI
Model	MAG B550M MORTAR MAX WIFI
Part Number	MAG B550M MORTAR MAX WIFI

Supported CPU
CPU Socket Type	AM4
CPU Type	upports AMD Ryzen™ 5000 Series, 5000 G-Series, 4000G-Series, and 3000 Series processors Support Socket AM4

Chipsets
Chipset	AMD B550

Memory
Number of Memory Slots	4x288pin (DDR4)
Memory Standard	4x DDR4 memory slots, support up to 128GB 1 Supports DDR4 1866/ 2133/ 2400/ 2667/ 2800/ 2933/ 3000/ 3066/ 3200 MHz by JEDEC Supports DDR4 2667/ 2800/ 2933/ 3000/ 3066/ 3200/ 3466/ 3600/ 3733/ 3866/ 4000/ 4133/ 4266/ 4400+ MHz by A-XMP OC MODE 1DPC 1R max speed 4400 MHZ 1DPC 2R max speed 3733 MHZ 2DPC 1R max speed 3866 MHZ 2DPC 2R max speed 3466 MHZ Dual channel memory architecture Supports non-ECC UDIMM memory Supports ECC UDIMM memory (non-ECC mode) Supports un-buffered memory Please refer www.msi.com for more information on compatible memory.
Maximum Memory Supported	128GB
Channel Supported	Dual Channel
ECC Supported	Non-ECC

Expansion Slots
PCI Express 3.0 x16	1x PCIe 3.0/ 4.0 x16 slot (PCI_E1) 1 1x PCIe 3.0 x16 slot (PCI_E4), supports x4 mode 2 2x PCIe 3.0 x1 slots The supported specification depends on installed processor.PCI_E4 will be unavailable when an M.2 SSD is installed in the M2_2 slot.

Storage Devices
Serial ATA (SATA)	6x SATA 6Gb/s ports
M.2	2x M.2 slots (Key M) M2_1 slot (from AMD processor) Supports PCIe 4.0/ 3.0 x4 1 Supports SATA 6Gb/s Supports 2242/ 2260/ 2280 storage devices M2_2 slot (from AMD B550 chipset) Supports PCIe 3.0x4 Supports 2242/ 2260/ 2280 storage devices The supported specification depends on installed processor.
SATA RAID	AMD B550 Chipset Supports RAID 0, RAID 1 and RAID 10 for SATA storage devices Supports RAID 0 and RAID 1 for M.2 NVMe storage devices

Onboard Audio
Audio Channels	Realtek® ALC1220P Codec 7.1-Channel High Definition Audio Supports S/PDIF output

Onboard LAN
Max LAN Speed	1x Realtek® RTL8125B 2.5Gbps LAN controller
Wireless LAN	AMD® Wi-Fi 6E1 The Wireless module is pre-installed in the M.2 (Key-E) slot Supports MU-MIMO TX/RX Supports 20MHz, 40MHz, 80MHz bandwidth in 2.4GHz/ 5GHz or 6GHz bands Supports 802.11 a/ b/ g/ n/ ac/ ax Supports Bluetooth® 5.22 Wi-Fi 6E 6GHz may depend on every country’s regulations and will be ready
Bluetooth	Yes

Rear Panel Ports
Back I/O Ports	DisplayPort 1.4 PS/2 Combo Port 2.5G LAN Port USB 3.2 Gen 2 10Gbps Type-A Wi-Fi / Bluetooth Antenna HD Audio Connectors HDMI™ 2.1 Port Flash BIOS Button USB 2.0 Port USB 3.2 Gen 1 5Gbps Type-A USB 3.2 Gen 2 10Gbps Type-C Optical S/PDIF OUT

Internal I/O Connectors
Other Connectors	1x 24-pin ATX main power connector 1x 8-pin ATX 12V power connector 6x SATA 6Gb/s connectors 2x M.2 slots (M-Key) 1x USB 3.2 Gen 1 5Gbps Type-C port 1x USB 3.2 Gen 1 5Gbps connector (supports additional 2 USB 3.2 Gen 1 5Gbps ports) 2x USB 2.0 connectors (supports additional 4 USB 2.0 ports) 1x 4-pin CPU fan connector 1x 4-pin water-pump fan connector 3x 4-pin system fan connectors 1x Front panel audio connector 2x System panel connectors 1x Chassis Intrusion connector 1x 4-pin RGB LED connector 2x 3-pin RAINBOW LED connectors 1xTPM module connector 1x Clear CMOS jumper

Physical Spec
Form Factor	Micro-ATX Form Factor 9.6 in. x 9.6 in. (24.4 cm x 24.4 cm)
Dimensions (W x L)	9.6" x 9.6"

Software Feature
Windows 11	Support for Windows® 11 64-bit, Windows® 10 64-bit

Features
Features	Supports AMD Ryzen™ 5000 Series, 5000 G-Series, 4000G-Series, and 3000 Series processors Supports DDR4 Memory, up to 4400+(OC) MHz Lightning Fast Game experience: PCIe 4.0, Lightning Gen 4 x4 M.2 with M.2 Shield Frozr, AMD Turbo USB 3.2 Gen 2 Premium Thermal Solution: Extended Heatsink Design with additional choke thermal pad rated for 7W/mk and PCB with 2oz thickened copper are built for high performance system and non-stop gaming experience. Enhanced Power Design: 8+2+1 Duet Rail Power System, Digital PWM, Core Boost, DDR4 Boost. 2.5G LAN and AMD Wi-Fi 6E Solution: Upgraded network solution for professional and multimedia use. Delivers a secure, stable and fast network connection. Pre-installed I/O Shield: Better EMI protection and more convenience for installation. Audio Boost: Reward your ears with studio grade sound quality for the most immersive gaming experience. Multi-GPU: With Steel Armor PCI-E slots. Supports AMD Crossfire™

Additional Information
First Listed on Newegg	August 12, 2026

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MSI MAG B550M MORTAR MAX WIFI DDR4 AM4 AMD B550 SATA 6Gb/s Micro-ATX Wi-Fi 6E 2.5Gbps LAN M.2 (Key-E) Motherboards - AMD

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MSI MAG B550M MORTAR MAX WIFI DDR4 AM4 AMD B550 SATA 6Gb/s Micro-ATX Wi-Fi 6E 2.5Gbps LAN M.2 (Key-E) Motherboards - AMD

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