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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

  • ProcessorATOM
  • 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.

How it compares

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

Price $96.99
Typical for this category: the median of 2,965 items is $97.99.

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Specifications

Processor
ProcessorATOM

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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