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

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.