We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
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

  • ProcessorUpports AMD Ryzen™ 5000 Series, 5000 G-Series, 4000G-Series,
  • ChipsetAMD B550
  • Form factorMicro-ATX Form Factor 9.6 in x 9.6 in (24.4 cm x 24.4 cm)
  • CPU socketAM4
  • Memory slot count4 × 288pin (DDR4)
  • Supported memory4x DDR4 memory slots, support up to 128 GB 1 Supports DDR4 1
  • 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.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $118.99
Cheaper than about 70% of the 1,906 comparable items (median $224.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameMSI
Model nameMAG B550M MORTAR MAX WIFI
Part numberMAG B550M MORTAR MAX WIFI
Processor
ProcessorUpports AMD Ryzen™ 5000 Series, 5000 G-Series, 4000G-Series, and 3000 Series processors
Support Socket AM4
CPU socketAM4
ChipsetAMD B550
Memory
Memory slot count4 × 288pin (DDR4)
Supported memory4x DDR4 memory slots, support up to 128 GB 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.
Max supported RAM128 GB
Memory channelsDual Channel
ECC supportNon-ECC
Storage
SATA ports6x SATA 6Gb/s ports
M.2 slots2x 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 3.0 × 4
Supports 2242/ 2260/ 2280 storage devices
The supported specification depends on installed processor.
SATA and RAID supportAMD 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 & video
Sound channelsRealtek® ALC1220P Codec
7.1-Channel High Definition Audio
Supports S/PDIF output
Connectivity
Maximum network speed1x Realtek® RTL8125B 2.5 Gbit/s LAN controller
Wi-Fi standardAMD® Wi-Fi 6E1
The Wireless module is pre-installed in the M.2 (Key-E) slot
Supports MU-MIMO TX/RX
Supports 20 MHz, 40 MHz, 80 MHz bandwidth in 2.4 GHz/ 5 GHz or 6 GHz bands
Supports 802.11 a/ b/ g/ n/ ac/ ax
Supports Bluetooth® 5.22
Wi-Fi 6E 6 GHz may depend on every country’s regulations and will be ready
Bluetooth supportYes
Ports & slots
Rear panel portsDisplayPort 1.4
PS/2 Combo Port
2.5G LAN Port
USB 3.2 Gen 2 10 Gbit/s 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 5 Gbit/s Type-A
USB 3.2 Gen 2 10 Gbit/s Type-C
Optical S/PDIF OUT
Size & build
Form factorMicro-ATX Form Factor
9.6 in x 9.6 in (24.4 cm x 24.4 cm)
Width and length9.6 in × 9.6 in
Compatibility
Windows 11 supportSupport for Windows® 11 64-bit, Windows® 10 64-bit

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.

More in Motherboards for AMD CPUs

Similar items