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Micro-ATX motherboard with black heatsinks and integrated I/O shield

MSI

MSI MAG B550M Mortar WiFi Gaming AMD motherboard AM4 DDR4 PCIe 4.0 SATA 6Gb/s M.2

SKU CH-S6AC-B1RHC

Micro-ATX AMD AM4 board with Wi-Fi 6, 2.5G LAN, PCIe 4.0 M.2 and DDR4 to 4400 MHz for Ryzen 5000 CPUs

  • CPU TypeATOM
  • Supports AMD Ryzen 5000 series processors for high gaming performance
  • Dual-channel DDR4 memory up to 128 GB at 4400 MHz for fast multitasking
  • PCIe 4.0 and M.2 Shield Frozr deliver lightning-fast storage speeds
  • 5G LAN and Wi-Fi 6 AX provide low-latency networking
  • Premium thermal solution with extended heatsink and 2oz copper PCB for sustained cooling

Micro-ATX AM4 board with Wi-Fi 6

This micro-ATX motherboard uses the B550 chipset and an AMD AM4 socket, supporting DDR4 memory up to 128 GB at 4400 MHz. It includes PCIe 4.0 lanes, SATA 6Gb/s ports, an M.2 slot with a dedicated heatsink, USB 3.2 Gen 2 connectivity and an integrated Wi-Fi 6 solution. The board measures 9.6 by 9.6 by 1.5 inches and ships with a pre-installed I/O shield.

Builders who need compact AM4 features

It suits builders who want a small-form-factor platform with 2.5 Gb LAN, Wi-Fi 6 and PCIe 4.0 storage support for Ryzen 5000 series processors. Buyers who require multiple full-length PCIe slots, extensive multi-GPU configurations or a larger ATX layout should look at something else.

Extended heatsink and thick copper under load

The premium thermal design uses an extended heatsink with a choke thermal pad rated for 7 W/mK alongside a PCB with 2 oz thickened copper. This combination helps maintain stable temperatures across the VRM and M.2 areas during sustained workloads rather than only brief bursts.

Highlights

  • Supports AMD Ryzen 5000 series processors for high gaming performance
  • Dual-channel DDR4 memory up to 128 GB at 4400 MHz for fast multitasking
  • PCIe 4.0 and M.2 Shield Frozr deliver lightning-fast storage speeds
  • 5G LAN and Wi-Fi 6 AX provide low-latency networking
  • Premium thermal solution with extended heatsink and 2oz copper PCB for sustained cooling

Specifications

CPU TypeATOM

Questions about this item

Which Ryzen 5000 series processor do I need to install in the AM4 socket?

Any Ryzen 5000 series processor fits the AM4 socket on this board; the manufacturer notes support for 3rd Gen Ryzen and future Ryzen processors with a BIOS update.

Can I keep my existing DDR4 memory when moving to this B550 board?

Yes, the board runs dual-channel DDR4 up to 128 GB at 4400 MHz, so your current DDR4 modules will work within those limits.

How do I confirm the Wi-Fi 6 and 2.5G LAN are active after assembly?

Open the LAN Manager utility in Windows; it will show the 2.5G LAN link speed and the Wi-Fi 6 AX connection status when both are working.

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