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Black Micro ATX motherboard with silver heatsinks and rear I/O shield

MSI

MSI MAG B550M MORTAR WIFI AMD motherboard

SKU CH-P147-SFEBF

Micro-ATX board for AM4 Ryzen CPUs with B550 chipset, dual-channel DDR4 up to 4400 MHz, 128 GB max, 2.5 Gbps LAN, Wi-Fi, 7.1 audio and two M.2 slots

  • ProcessorSupports AM4 socket 3rd Gen AMD Ryzen processors, and future
  • ChipsetAMD B550
  • CPU socketSocket AM4
  • Supported memorySupport dual-channel DDR4 1866/2133/2400/2667/2800/2933/3000
  • Max supported RAM128 GB
  • PCI slots1x PCIe 3.0/ 4.0 x16 slot (PCI_E1) 1x PCIe 3.0 x16 slot (PCI
  • Supports up to 128GB DDR4 memory capacity
  • 5Gbps LAN for fast wired networking
  • Realtek ALC1200/ALC1220P codec delivers 7.1-channel audio
  • PCIe 4.0 x16 slot enables high-speed graphics
  • Dual M.2 plus six SATA III ports for storage expansion

AM4 B550 Micro-ATX board

The MSI MAG B550M MORTAR WIFI is a Micro-ATX motherboard built around the AMD B550 chipset for Socket AM4 processors. It supports 3rd Gen AMD Ryzen CPUs and future Ryzen processors with a BIOS update. Dual-channel DDR4 memory runs at speeds up to 4400+ MHz with a maximum capacity of 128GB. The board includes integrated Wi-Fi and a 2.5Gbps LAN controller.

Before ordering checks

Confirm your CPU is a Socket AM4 Ryzen processor supported by the B550 chipset. Verify your chassis accepts a Micro-ATX form factor. Ensure your DDR4 modules match the supported speed list and that total memory does not exceed 128GB. Check that your power supply provides the required ATX and CPU power connectors for this board. The rear I/O panel is supplied in the box.

Who this suits

This board suits builders who need a compact AM4 platform with 2.5Gbps wired networking and onboard Wi-Fi. It fits Micro-ATX cases and handles high-speed DDR4 up to 4400+ MHz. Users requiring full-size ATX layouts, more than two M.2 slots, or newer AM5 socket CPUs should look at alternative products.

How it compares

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

Price $137.99
Cheaper than about 65% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Product lineMSI MAG B550M MORTAR WIFI
Model nameMSI MAG B550M MORTAR WIFI
Processor
ProcessorSupports AM4 socket 3rd Gen AMD Ryzen processors, and future AMD Ryzen processors with BIOS update
CPU socketSocket AM4
ChipsetAMD B550
Memory
Supported memorySupport dual-channel DDR4 1866/2133/2400/2667/2800/2933/3000/3066/3200/3466/3600/3733/3866/4000/4133/4266/4400 + MHz memory
Max supported RAM128 GB
Storage
SATA and RAID support2XM.2 interface, 6xSATA III interface
Audio & video
Audio chipRealtek ALC1200/ALC1220P Codec
7.1-Channel High Definition Audio
Supports S/PDIF output
Connectivity
Ethernet controller1x Realtek RTL8125B 2.5 Gbit/s LAN controller
Ports & slots
PCI slots1x PCIe 3.0/ 4.0 x16 slot (PCI_E1)
1x PCIe 3.0 x16 slot (PCI_E4), supports x4 mode
2x PCIe 3.0 x1 slots

Questions about this item

Does the board ship with a Wi-Fi antenna and back-panel I/O shield?

The package includes the motherboard, a CMOS battery, one SATA cable, the chassis I/O back panel and a Wi-Fi antenna for the onboard wireless module.

Should I pick a 3200 MHz kit or a faster 3600 MHz kit for this B550 board?

Both speeds are on the supported DDR4 list; 3600 MHz will run at its rated frequency when XMP is enabled and the CPU memory controller allows it.

What does the 2.5 Gbps LAN controller mean for everyday file transfers?

The Realtek RTL8125B provides up to 2.5 Gbps wired throughput, so large copies to a NAS or another 2.5 GbE device finish roughly two and a half times faster than on a standard 1 GbE link.

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