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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

  • CPU Socket TypeSocket AM4
  • CPU TypeSupports AM4 socket 3rd Gen AMD Ryzen processors, and future
  • ChipsetAMD B550
  • Memory StandardSupport dual-channel DDR4 1866/2133/2400/2667/2800/2933/3000
  • Maximum Memory Supported128GB
  • 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.

Highlights

  • 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

Specifications

BrandMSI
SeriesMSI MAG B550M MORTAR WIFI
ModelMSI MAG B550M MORTAR WIFI
CPU Socket TypeSocket AM4
CPU TypeSupports AM4 socket 3rd Gen AMD Ryzen processors, and future AMD Ryzen processors with BIOS update
ChipsetAMD B550
Memory StandardSupport dual-channel DDR4 1866/2133/2400/2667/2800/2933/3000/3066/3200/3466/3600/3733/3866/4000/4133/4266/4400 + MHz memory
Maximum Memory Supported128GB
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
SATA RAID2XM.2 interface, 6xSATA III interface
Audio ChipsetRealtek ALC1200/ALC1220P Codec
7.1-Channel High Definition Audio
Supports S/PDIF output
LAN Chipset1x Realtek RTL8125B 2.5Gbps LAN controller
Onboard USBAMD B550 Chipset
3x USB 3.2 Gen 1 5Gbps ports (1 Type-C internal connector, and 2 ports are available through the internal USB 3.2 Gen 1 5Gbps connector)
6x USB 2.0 ports (2 Type-A ports on the back panel, 4 ports through the internal USB 2.0 connectors)
AMD Processor
2x USB 3.2 Gen 2 10Gbps ports (1 Type-C port and 1 Type-A port on the back panel)
2x USB 3.2 Gen 1 5Gbps Type-A ports on the back panel

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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