ASUS Prime B550M-A DDR4 AMD Motherboard

The ASUS Prime B550M-A is a Micro-ATX motherboard built on the AMD B550 chipset, designed to pair with 3rd Generation AMD Ryzen processors via the AM4 socket. Its compact 9.6 x 9.6-inch (24.4 x 24.4 cm) footprint makes it a sensible choice for space-efficient desktop builds without sacrificing the connectivity and stability that everyday users and PC builders expect. Memory support is generous for a platform of this class. The board provides four DDR4 DIMM slots capable of accommodating up to 128 GB of unbuffered DDR4 memory, with standard speeds from 2133 MHz up to 3200 MHz and overclocked profiles reaching 4600 MHz (O.C.). ECC memory support is present but varies depending on the installed CPU. Storage options cover a wide range of needs. A CPU-connected M.2 slot supports PCIe 4.0 x4 and SATA modes for drives up to 22110 form factor, while a second chipset-connected M.2 slot supports PCIe 3.0 x4 and SATA in up to 2280 form factor. Four SATA 6 Gb/s ports round out the lineup, with RAID 0, 1, and 10 configurations supported across compatible devices. Expansion slots include one PCIe 4.0 x16 slot (running at x16 mode, sourced from the CPU) and two PCIe 3.0 x1 slots from the B550 chipset. Rear connectivity consists of six USB ports (two USB 3.2 Gen 2 Type-A and four USB 3.2 Gen 1 Type-A), alongside D-Sub, DVI-D, and HDMI display outputs for use with Ryzen APUs. Networking is handled by a Realtek RTL8111H Gigabit Ethernet controller. Audio is delivered through a Realtek ALC887 7.1-channel HD audio codec with audio shielding, dedicated audio PCB layers, and Japanese audio capacitors, supporting up to 24-bit/192 kHz playback. RGB lighting is managed through ASUS Aura Sync, with two standard RGB headers and one Addressable Gen 2 RGB header board. Protection features fall under the ASUS 5X Protection III umbrella, covering DIGI+ VRM, LANGuard, overvoltage protection, SafeSlot Core reinforced PCIe slot, and a stainless-steel back I/O panel. BIOS is a 256 Mb Flash ROM UEFI AMI implementation with CrashFree BIOS 3, EZ Flash 3, and EZ Mode for accessible setup. Verified Specifications: - Socket: AMD AM4 | Chipset: AMD B550 - Form Factor: Micro-ATX, 9.6 x 9.6 in (24.4 x 24.4 cm) - Memory: 4x DDR4 DIMM, Max 128 GB, up to DDR4-4600 (O.C.) - Storage: 1x M.2 PCIe 4.0 x4/SATA (up to 22110) + 1x M.2 PCIe 3.0 x4/SATA (up to 2280) + 4x SATA 6 Gb/s; RAID 0/1/10 - Expansion: 1x PCIe 4.0 x16, 2x PCIe 3.0 x1 - Display Output: 1x D-Sub, 1x DVI-D, 1x HDMI - LAN: Realtek RTL8111H 1 GbE - Audio: Realtek ALC887, 7.1 HD, up to 24-bit/192 kHz - Rear USB: 2x USB 3.2 Gen 2 Type-A, 4x USB 3.2 Gen 1 Type-A - BIOS: 256 Mb Flash ROM, UEFI AMI - Warranty: 3 Years