GIGABYTE B550 UD AC AM4 DDR4 AMD Motherboard

The Gigabyte B550 UD AC is a full-size ATX motherboard built on the AMD B550 chipset, designed for AMD Socket AM4 processors. It supports AMD Ryzen 5000 Series, Ryzen 5000 G-Series, Ryzen 4000 G-Series, Ryzen 3000 Series, and Ryzen 3000 G-Series processors, making it a versatile platform for a wide range of AMD CPU configurations. At the heart of its power delivery is a 10+3 phase digital VRM solution using Low RDS MOSFETs, which helps minimise switching losses and maintain lower operating temperatures under sustained CPU workloads. Memory support spans four DDR4 DIMM slots with a maximum capacity of 128 GB (using 32 GB modules per slot), and the board supports speeds from 2133 MHz up to 4733 MHz (O.C.) as well as XMP profiles. Both ECC and non-ECC unbuffered configurations are supported, though ECC mode availability depends on the installed CPU. Storage options are generous: two M.2 Socket 3 (M-key) connectors accommodate drives up to 22110 form factor. The CPU-side M.2 slot supports PCIe 4.0 x4 with Ryzen 5000/3000 non-G processors, while the chipset-side slot operates at PCIe 3.0 x4. Four SATA 6 Gb/s ports round out the storage connectivity, with support for RAID 0, 1, and 10. Wireless connectivity is provided by the AzureWave AW-CB304NF module (Realtek RTL8821CE), supporting 802.11a/b/g/n/ac dual-band (2.4/5 GHz) Wi-Fi and Bluetooth 5.0. Wired networking is handled by a Realtek GbE LAN chip with bandwidth management software. The back panel includes an HDMI 2.1 port supporting up to 4096×2160 at 60 Hz with HDCP 2.3 and HDR for systems using CPUs with integrated Radeon graphics. USB connectivity includes USB 3.2 Gen 2 Type-A (on Ryzen 5000/3000 non-G platforms), a USB Type-C port (USB 3.2 Gen 1) on the back panel, two USB 3.2 Gen 1 Type-A ports, and four USB 2.0 ports on the back panel. An internal USB Type-C header adds front-panel USB 3.2 Gen 1 Type-C support. Q-Flash Plus enables BIOS updates without a CPU, memory, or GPU installed. RGB Fusion 2.0 supports up to 300 addressable LEDs via two addressable LED strip headers and two standard RGB headers. Smart Fan 5 provides PWM/DC hybrid fan control across five headers including a dedicated water-cooling pump header. Verifiable Specifications: • Chipset: AMD B550 • Socket: AMD AM4 • Form Factor: ATX, 30.5 cm × 24.4 cm • Memory: 4× DDR4 DIMM, up to 128 GB, DDR4-2133 to 4733(O.C.) • PCIe x16 Slot: PCIe 4.0 x16 (Ryzen 5000/3000 non-G) or PCIe 3.0 x16 (G-Series) • M.2 Slots: 2× M-key Socket 3 (up to 22110); M2A_CPU: PCIe 4.0 x4; M2B_SB: PCIe 3.0 x4 • SATA: 4× SATA 6 Gb/s; RAID 0/1/10 • Wi-Fi: 802.11ac dual-band (Realtek RTL8821CE via AzureWave AW-CB304NF) • Bluetooth: 5.0 • LAN: Realtek GbE (1 Gbps/100 Mbps/10 Mbps) • HDMI: 1× HDMI 2.1 (max 4096×2160@60 Hz, HDCP 2.3, HDR) • Audio: Realtek HD Audio CODEC, up to 7.1-channel • BIOS: AMI UEFI, 128 Mbit flash, Q-Flash Plus • OS Support: Windows 11 64-bit, Windows 10 64-bit