Asus Prime B550M-A WIFI II M-ATX Motherboard

The ASUS Prime B550M-A WiFi II is a Micro-ATX motherboard built on the AMD B550 chipset with an AM4 socket, designed to support AMD Ryzen 5000 Series, Ryzen 5000 G-Series, Ryzen 4000 G-Series, and Ryzen 3000 Series desktop processors. Its compact 24.4 cm × 24.4 cm footprint makes it well suited for space-conscious builds that still demand high-end connectivity. Connectivity is a strong suit. The board features 2×2 Wi-Fi 6 (802.11 a/b/g/n/ac/ax) covering 2.4 GHz and 5 GHz bands, Bluetooth 5.2, and a Realtek 1 Gb Ethernet port protected by ASUS LANGuard surge protection. For wired peripherals, the rear I/O provides 2 × USB 3.2 Gen 2 Type-A ports, 4 × USB 3.2 Gen 1 Type-A ports, and a PS/2 combo port, while three internal headers add up to 6 further USB ports (2 × Gen 1 + 4 × USB 2.0). Storage options include two M.2 Key-M slots and four SATA 6 Gb/s ports with RAID 0, 1, and 10 support. With Ryzen 5000 Series or 3000 Series CPUs, the primary M.2 slot operates at PCIe 4.0 x4 and accepts drives up to the 22110 size, while the secondary M.2 slot (B550 chipset-fed) runs PCIe 3.0 x4. The single full-length PCIe slot also operates at PCIe 4.0 x16 with those same CPU generations. Memory support spans four DDR4 DIMM slots accommodating up to 128 GB in dual-channel configuration. Standard native speeds run from DDR4-2133 through DDR4-3200, with overclocked profiles available up to DDR4-4866. ECC mode availability depends on the installed CPU. Display outputs — D-Sub, DVI-D, and HDMI (with 4K@60 Hz support per HDMI 2.1 spec) — serve users pairing the board with APU-based Ryzen G-Series processors. Audio is handled by a Realtek High Definition Audio CODEC offering 7.1 surround sound, 24-bit/192 kHz playback, audio shielding, and dedicated PCB audio layers. Thermal management relies on a VRM heatsink with thermal pads, a PCH heatsink, and four hybrid 4-pin fan headers (1 × CPU, 1 × CPU OPT, 2 × chassis), managed via the Fan Xpert 2+ utility. Protection features fall under ASUS 5X Protection III, covering DIGI+ VRM, LANGuard, overvoltage protection, SafeSlot Core reinforcement, and stainless-steel rear I/O. RGB customisation is provided by one onboard Addressable Gen 2 (ARGB) header and two standard AURA RGB headers, all manageable through Armoury Crate with AURA Sync compatibility. The UEFI uses 256 Mb Flash ROM with AMI BIOS, supporting CrashFree BIOS 3, EZ Flash 3, and EZ Mode. The board carries a 3-year warranty and supports Windows 10 and Windows 11 (64-bit). Verified Specifications: — Socket: AM4 | Chipset: AMD B550 | Form Factor: Micro-ATX (24.4 × 24.4 cm) — CPU Support: Ryzen 5000 / 5000 G / 4000 G / 3000 Series — Memory: 4 × DDR4 DIMM, dual-channel, max 128 GB, up to DDR4-4866 (OC) — PCIe: 1 × PCIe 4.0 x16 (Ryzen 5000/3000) or PCIe 3.0 x16 (G-Series); 2 × PCIe 3.0 x1 — Storage: 2 × M.2 Key-M + 4 × SATA 6 Gb/s; RAID 0/1/10 — Wireless: Wi-Fi 6 (802.11ax) 2×2, 2.4/5 GHz + Bluetooth 5.2 — Rear USB: 2 × USB 3.2 Gen 2 + 4 × USB 3.2 Gen 1 (all Type-A) — Display: D-Sub, DVI-D, HDMI (4K@60 Hz) — Audio: Realtek 7.1 HD, 24-bit/192 kHz — BIOS: 256 Mb Flash ROM, UEFI AMI — Warranty: 3 Years