ASROCK B550M Pro4 DDR4 AMD Motherboard

The ASRock B550M Pro4 is a Micro ATX motherboard built on AMD's B550 chipset, designed for the AM4 socket and compatible with 3rd Generation AMD Ryzen processors (Matisse). Note: this board is not compatible with AMD Ryzen 5 3400G or Ryzen 3 3200G. Its compact 9.6 x 9.6 inch (24.4 x 24.4 cm) footprint makes it a practical foundation for space-conscious desktop builds without sacrificing connectivity or expansion headroom. The board ships with an 8-phase digital power delivery design and a Premium 50A power choke rated to deliver stable Vcore under load. The 2oz copper PCB inner layers and high-density glass fabric construction are designed to support signal integrity and thermal management during extended operation. For storage, the B550M Pro4 offers one Hyper M.2 socket (M2_1) capable of PCIe Gen4 x4 speeds up to 64 Gb/s when paired with a compatible Matisse CPU, and a second M.2 socket (M2_2) supporting PCIe Gen3 x2 (up to 16 Gb/s) or SATA3. Both sockets accept M Key type 2280 modules. Six SATA3 6.0 Gb/s ports with support for RAID 0, RAID 1, and RAID 10 round out local storage options. Note that M2_2 and SATA3 ports 5 and 6 share bandwidth; enabling one disables the other. Memory support spans four DDR4 DIMM slots in dual-channel configuration, accommodating up to 128GB total. Ryzen Matisse CPUs support DDR4 speeds from 2133 up to 4533+ MHz (OC), and XMP profiles are supported. DIMM slots feature 15-micron gold contacts. Expansion slots include one PCIe x16 slot running at Gen4 x16 (with Matisse) or Gen3 x16 (with APUs), one PCIe x16 physical slot operating at Gen3 x4, and one PCIe 3.0 x1 slot. AMD CrossFireX multi-GPU is supported. An M.2 Key E slot accepts a 2230 WiFi/Bluetooth module (not included). Rear I/O provides D-Sub, HDMI, and DisplayPort 1.4 outputs for triple-monitor use with compatible APUs; HDMI 2.1 supports up to 4K (4096x2160) at 60Hz. USB connectivity includes one USB 3.2 Gen2 Type-A and one Type-C port (both at 10 Gb/s), four USB 3.2 Gen1 Type-A ports, and two USB 2.0 ports. A Realtek RTL8111H Gigabit LAN controller handles wired networking with Wake- LAN and 802.3az Energy Efficient Ethernet support. Audio is handled by the Realtek ALC1200 codec delivering 7.1-channel HD audio with PCB isolate shielding and Nahimic Audio software enhancement. The board also includes two RGB LED headers (12V/3A, 36W) and two addressable LED headers (5V/3A, 15W) for Polychrome RGB Sync compatibility. A POST Status Checker (PSC) provides four-LED diagnostic indicators for CPU, DRAM, VGA, and boot device states, simplifying troubleshooting at startup. Key Specifications: - Chipset: AMD B550 - Socket: AM4 (3rd Gen AMD Ryzen; not compatible with Ryzen 5 3400G / Ryzen 3 3200G) - Form Factor: Micro ATX, 9.6 x 9.6 in (24.4 x 24.4 cm) - Memory: 4x DDR4 DIMM, dual-channel, max 128GB, up to DDR4 4533+ (OC) - Storage: 6x SATA3 6.0 Gb/s (RAID 0/1/10); 1x Hyper M.2 PCIe Gen4 x4 (64 Gb/s); 1x M.2 PCIe Gen3 x2 / SATA3 - PCIe: 1x PCIe 4.0 x16, 1x PCIe 3.0 x16 (x4 mode), 1x PCIe 3.0 x1 - Display Outputs: D-Sub (1920x1200@60Hz), HDMI 2.1 (4K@60Hz), DisplayPort 1.4 (5K@120Hz) - USB (Rear): 1x USB 3.2 Gen2 Type-A, 1x USB 3.2 Gen2 Type-C, 4x USB 3.2 Gen1, 2x USB 2.0 - LAN: Realtek RTL8111H Gigabit (10/100/1000 Mb/s) - Audio: Realtek ALC1200, 7.1 CH HD - BIOS: 256Mb AMI UEFI with GUI - Warranty: 3 Years - Certifications: FCC, CE; ErP/EuP ready