ASROCK B550 Pro4 DDR4 AMD Motherboard

The ASRock B550 Pro4 is an ATX-form-factor motherboard (30.5 cm × 24.4 cm) built around the AMD B550 chipset and the AM4 socket. It is compatible with AMD Ryzen 3000-series, 4000 G-Series (Renoir APUs), and 5000-series desktop processors — note that Ryzen 5 3400G and Ryzen 3 3200G are explicitly not supported. The board’s power delivery consists of an 8-phase Digi Power design backed by premium 50A power chokes and a 2-ounce copper PCB, helping maintain stable Vcore voltages during demanding workloads or overclocking sessions. Memory support spans four DDR4 DIMM slots in dual-channel configuration with a maximum capacity of 128 GB. Matisse-based Ryzen CPUs can run DDR4 up to 4533+ (OC), while Renoir APUs push the ceiling to DDR4 4733+ (OC). Both ECC and non-ECC unbuffered modules are supported, and XMP profiles are recognized by the UEFI. For expansion, Ryzen (Matisse) CPUs unlock the primary x16 slot at PCIe 4.0 bandwidth, making the Hyper M.2 socket (M2_1) capable of Gen4 ×4 speeds up to 64 Gb/s with compatible NVMe drives. A second M.2 socket (M2_3) operates at PCIe Gen3 ×2 or SATA3, and six SATA3 6 Gb/s ports with RAID 0/1/10 support round out internal storage. Note that M2_3 and SATA3 ports 5–6 share lanes and cannot be used simultaneously. Display output is handled via HDMI 2.1 (up to 4K/60 Hz, HDR, HDCP 2.3) and a D-Sub port (up to 1920×1200 @ 60 Hz), available when using a Ryzen APU with integrated Radeon Vega graphics. Audio is delivered through a Realtek ALC1200 codec with 7.1-channel HD output, isolated left/right PCB layers, surge protection, and Nahimic Audio software. Networking is handled by a Realtek RTL8111H Gigabit LAN controller (10/100/1000 Mb/s) with Wake- LAN and Energy Efficient Ethernet 802.3az support. Rear I/O includes one USB 3.2 Gen2 Type-A (10 Gb/s), one USB 3.2 Gen2 Type-C (10 Gb/s), four USB 3.2 Gen1 Type-A ports, a PS/2 combo port, HDMI, D-Sub, RJ-45, and three HD audio jacks. Internal headers add four further USB 2.0 ports and two USB 3.2 Gen1 ports. RGB enthusiasts will find two 12 V RGB headers (up to 36 W each) and two 5 V addressable RGB headers (up to 15 W each), all manageable via ASRock Polychrome SYNC software. The board ships with a 3-year manufacturer warranty and carries FCC and CE certifications. Key Verified Specifications: • Chipset: AMD B550 | Socket: AM4 | Form Factor: ATX (30.5 × 24.4 cm) • CPU Support: AMD Ryzen 3000, 4000 G-Series, 5000 Series (not Ryzen 5 3400G / Ryzen 3 3200G) • Memory: 4× DDR4 DIMM, dual-channel, max 128 GB; DDR4 4733+ (OC) with Renoir APUs • Primary PCIe Slot: Gen4 ×16 (Matisse) / Gen3 ×16 (Renoir) • Storage: 1× Hyper M.2 PCIe Gen4 ×4, 1× M.2 PCIe Gen3 ×2 / SATA3, 6× SATA3 6 Gb/s • Audio: Realtek ALC1200, 7.1 CH HD, Nahimic Audio • LAN: Realtek RTL8111H, 1 GbE • USB Rear: 1× Gen2 Type-A, 1× Gen2 Type-C, 4× Gen1 Type-A • Display: HDMI 2.1 (4K/60 Hz), D-Sub (1920×1200) • RGB: 2× 12 V RGB headers, 2× 5 V ARGB headers • Warranty: 3 Years | Certifications: FCC, CE