MSI B550M-A Pro DDR4 AMD Motherboard

The MSI B550M-A Pro is a Micro-ATX form-factor motherboard built on the AMD B550 chipset, designed for builders who want PCIe 4.0 capability and broad AMD Ryzen compatibility in a compact footprint. It supports AMD Ryzen 5000 Series, Ryzen 4000 G-Series, and Ryzen 3000 Series desktop processors — note that AMD Ryzen 5 3400G and Ryzen 3 3200G are not compatible with this board. Memory flexibility is a key strength. Two DDR4 DIMM slots accommodate up to 64 GB in dual-channel configuration, running at standard JEDEC speeds from 1866 MHz through 3200 MHz, and up to 4600 MHz via A-XMP overclocking profiles. Single-rank, single-DIMM configurations can reach 4600 MHz, while dual-rank configurations are rated up to 3866 MHz. Non-ECC unbuffered memory is natively supported, and ECC UDIMM modules can be installed in non-ECC mode. Storage connectivity centres on a single M.2 Key-M slot fed directly from the AMD processor, supporting PCIe 4.0 or PCIe 3.0 NVMe devices as well as SATA drives in 2242, 2260, and 2280 lengths. Four SATA 6 Gb/s ports round out storage options, and RAID 0, 1, and 10 are supported for SATA devices while RAID 0 and 1 are available for M.2 NVMe pairs. Expansion is handled by one PCIe 4.0/3.0 x16 slot for a discrete graphics card and one PCIe 3.0 x1 slot for auxiliary cards. Display output for APU-based builds comes via HDMI 2.1 (up to 4096×2160 @ 60 Hz) and DVI-D (up to 1920×1200 @ 60 Hz), with up to 16 GB shared system memory allocated to integrated graphics. USB connectivity totals four USB 3.2 Gen 1 5 Gbps Type-A ports on the rear panel plus two more via an internal header, alongside six USB 2.0 ports (two rear, four internal). Networking is provided by a Realtek RTL8111H Gigabit LAN controller. Audio uses a Realtek ALC892/ALC897 codec delivering 7.1-channel High Definition Audio. Board protection features include MSI PCI-E Steel Armor on the x16 slot for extra soldering support and EMI shielding, Double ESD protection around mounting holes, and a 2 oz thickened copper PCB for improved heat dissipation. Fan management covers one 4-pin CPU fan header and one 4-pin system fan header, controllable through BIOS or MSI Dragon Center software. EZ Debug LEDs assist with POST troubleshooting. The board carries a 3-year manufacturer warranty. Verified Specifications: - Form Factor: Micro-ATX, 9.3 in × 7.9 in (23.6 cm × 20 cm), 8 mounting holes - Chipset: AMD B550 - CPU Support: AMD Ryzen 5000 Series, Ryzen 4000 G-Series, Ryzen 3000 Series (excl. Ryzen 5 3400G & Ryzen 3 3200G) - Memory: 2× DDR4 DIMM, max 64 GB, JEDEC up to 3200 MHz, A-XMP OC up to 4600 MHz - PCIe: 1× PCIe 4.0/3.0 x16, 1× PCIe 3.0 x1 - M.2: 1× Key-M (PCIe 4.0/3.0 or SATA; 2242/2260/2280) - SATA: 4× 6 Gb/s - RAID: SATA — 0/1/10; NVMe M.2 — 0/1 - Display: HDMI 2.1 (4K@60Hz), DVI-D (1920×1200@60Hz) - USB Rear: 4× USB 3.2 Gen 1 5Gbps Type-A, 2× USB 2.0 Type-A - LAN: Realtek RTL8111H Gigabit - Audio: Realtek ALC892/ALC897, 7.1-CH HD Audio - Warranty: 3 Years