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Dark green Micro-ATX board with extended silver heatsinks, black PCB, pre-installed Wi-Fi 6E module, rear I/O shield, four DDR4 slots

MSI

MSI MAG B550M MORTAR MAX WIFI AMD motherboard

SKU CH-1F4J-CN86Y

Micro-ATX AM4 board with Wi-Fi 6E, 2.5Gbps LAN, dual M.2 slots, four DDR4 slots up to 128GB and extended heatsinks for Ryzen 5000 series CPUs

  • CPU Socket TypeAM4
  • CPU Typeupports AMD Ryzen™ 5000 Series, 5000 G-Series, 4000G-Series,
  • ChipsetAMD B550
  • Number of Memory Slots4x288pin (DDR4)
  • Memory Standard4x DDR4 memory slots, support up to 128GB 1 Supports DDR4 18
  • Maximum Memory Supported128GB
  • Extended heatsink keeps high-end CPUs at full speed
  • Wi-Fi 6E adds 6 GHz spectrum with MU-MIMO for 2400Mbps
  • M.2 Shield FROZR cools SSDs to prevent throttling
  • Core Boost digital power design supports more cores
  • Lightning Gen4 PCI-E and M.2 delivers up to 64GB/s bandwidth

Micro-ATX AM4 board with Wi-Fi 6E

The MSI MAG B550M MORTAR MAX WIFI is a Micro-ATX motherboard built on the AMD B550 chipset for Socket AM4 processors. It accepts Ryzen 5000 Series, 5000 G-Series, 4000G-Series and 3000 Series CPUs. Four DDR4 slots support up to 128 GB in dual-channel mode.

Builders adding wireless and 2.5G LAN

Integrated AMD Wi-Fi 6E and a Realtek 2.5Gbps LAN port give modern wireless and wired connectivity without extra cards. The board also provides HDMI 2.1, DisplayPort 1.4, USB 3.2 Gen 2 10Gbps Type-A and Type-C, plus six SATA 6Gb/s ports. Users who need more than two M.2 slots or a larger ATX form factor should consider other models.

Two M.2 slots with Gen4 on the primary

The primary M.2 slot runs at PCIe 4.0 x4 from the CPU and fits 2242, 2260 and 2280 drives. The second slot runs at PCIe 3.0 x4 from the chipset. This layout decides whether your storage plan fits the board.

Highlights

  • Extended heatsink keeps high-end CPUs at full speed
  • Wi-Fi 6E adds 6 GHz spectrum with MU-MIMO for 2400Mbps
  • M.2 Shield FROZR cools SSDs to prevent throttling
  • Core Boost digital power design supports more cores
  • Lightning Gen4 PCI-E and M.2 delivers up to 64GB/s bandwidth

Specifications

BrandMSI
ModelMAG B550M MORTAR MAX WIFI
Part NumberMAG B550M MORTAR MAX WIFI
CPU Socket TypeAM4
CPU Typeupports AMD Ryzen™ 5000 Series, 5000 G-Series, 4000G-Series, and 3000 Series processors
Support Socket AM4
ChipsetAMD B550
Number of Memory Slots4x288pin (DDR4)
Memory Standard4x 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 Supported128GB
Channel SupportedDual Channel
ECC SupportedNon-ECC
PCI Express 3.0 x161x 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.
Serial ATA (SATA)6x SATA 6Gb/s ports
M.22x 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 RAIDAMD 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
Audio ChannelsRealtek® ALC1220P Codec
7.1-Channel High Definition Audio
Supports S/PDIF output
Max LAN Speed1x Realtek® RTL8125B 2.5Gbps LAN controller
Wireless LANAMD® 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
BluetoothYes
Back I/O PortsDisplayPort 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
Other Connectors1x 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
Form FactorMicro-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"
Windows 11Support for Windows® 11 64-bit, Windows® 10 64-bit
FeaturesSupports 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

Questions about this item

What clearance does the extended PWM heatsink need around the AM4 socket for a CPU cooler?

The extended PWM heatsink sits directly around the AM4 socket; choose a cooler that clears the heatsink height and does not overhang the 4-pin CPU power connector.

Which screw secures the Wi-Fi 6E module in the M.2 Key-E slot during installation?

The Wi-Fi 6E module is pre-installed in the M.2 Key-E slot and held by a single M.2 standoff screw; do not remove it unless you are replacing the module.

When should the M.2 Shield FROZR thermal pad be replaced on this board?

Replace the thermal pad if it becomes compressed, torn, or loses tackiness after repeated SSD swaps; peel off the old pad, clean the surface, and apply a new pad of the same thickness.

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