MSI MAG B550M Mortar MAX Wifi DDR4 AMD Motherboard

The MSI MAG B550M Mortar MAX WiFi is a Micro-ATX motherboard built on AMD's B550 chipset, designed for the AM4 socket and compatible with AMD Ryzen 5000 Series, 5000 G-Series, 4000G-Series, and 3000 Series processors. Its compact 9.6 in. x 9.6 in. (24.4 cm x 24.4 cm) footprint makes it an attractive choice for space-conscious builds that still demand high-end connectivity and performance headroom. On the memory side, the board offers four DDR4 DIMM slots supporting up to 128 GB in a dual-channel configuration. By JEDEC standards speeds reach DDR4-3200, while A-XMP overclocking profiles push supported kits to 4400+ MHz under a 1DPC single-rank configuration. The board operates only with un-buffered, non-ECC DIMMs (ECC modules run in non-ECC mode). Storage flexibility is generous: two M.2 Key-M slots handle NVMe and SATA drives in 2242, 2260, and 2280 form factors. The primary M.2 slot (M2_1), routed from the processor, supports PCIe 4.0/3.0 x4 and is covered by MSI's M.2 Shield Frozr heatsink. The secondary slot (M2_2) runs PCIe 3.0 x4 via the B550 chipset. Six SATA 6 Gb/s ports round out the storage options, and the chipset enables RAID 0, 1, and 10 across SATA devices and RAID 0/1 for NVMe drives. Networking is a standout area. A Realtek RTL8125B controller delivers 2.5 Gbps wired LAN, while the pre-installed AMD Wi-Fi 6E module (M.2 Key-E slot) covers the 2.4 GHz, 5 GHz, and 6 GHz bands with 802.11a/b/g/n/ac/ax support, MU-MIMO TX/RX, and Bluetooth 5. The onboard audio solution uses a Realtek ALC1220P codec for 7.1-channel high-definition audio with optical S/PDIF output. Power delivery uses an 8+2+1 Duet Rail Power System with Digital PWM, Core Boost, and an extended heatsink featuring a choke thermal pad rated at 7 W/mK alongside a 2 oz copper-thickened PCB. The back panel includes USB 3.2 Gen 2 10 Gbps Type-C and Type-A ports, USB 3.2 Gen 1 5 Gbps Type-A ports, USB 2.0 ports, HDMI 2.1 (4096×2160 @ 60 Hz), DisplayPort 1.4, a Flash BIOS Button, PS/2 combo port, and optical S/PDIF output. A pre-installed I/O shield aids assembly and EMI protection. RGB and addressable ARGB headers plus a TPM connector are included internally. Verified Specifications: • Form Factor: Micro-ATX (24.4 cm × 24.4 cm) • Socket: AM4 • Chipset: AMD B550 • CPU Support: Ryzen 5000/5000G/4000G/3000 Series • Memory: 4× DDR4 DIMM, up to 128 GB; JEDEC up to DDR4-3200; A-XMP OC up to 4400+ MHz • PCIe: 1× PCIe 4.0/3.0 x16; 1× PCIe 3.0 x16 (x4 mode); 2× PCIe 3.0 x1 • M.2: 2× Key-M (M2_1: PCIe 4.0/3.0 x4 + SATA; M2_2: PCIe 3.0 x4) • SATA: 6× SATA 6 Gb/s with RAID 0/1/10 • LAN: Realtek RTL8125B 2.5 Gbps • Wireless: AMD Wi-Fi 6E (802.11ax, 2.4/5/6 GHz, MU-MIMO) + Bluetooth 5 • Audio: Realtek ALC1220P, 7.1-ch HD, S/PDIF out • Display: HDMI 2.1 (4K@60Hz), DisplayPort 1.4 (4K@60Hz) • Multi-GPU: 2-Way AMD CrossFire • OS: Windows 11 64-bit, Windows 10 64-bit • Warranty: 3 Years