ASUS PRIME B550M-A WIFI II AM4 Micro ATX Motherboard – DDR4 4866 (OC), PCIe 4.0 x16, Wi-Fi 6 + BT 5.2, 2x M.2 PCIe 4.0, HDMI + DVI + VGA | 90MB19X0-M0EAY0

Tune It Your Way

Comprehensive controls form the foundation of the ASUS Prime series. The Prime B550M-A WIFI II packs flexible tools to tune every aspect of your system — UEFI BIOS, EPU power saving, Fan Xpert 2+ cooling control and Digi+ VRM management — enabling you to tweak performance settings to perfectly match the way you work and maximize your productivity.

Cool to the Core

Prime B550 series is engineered with multiple onboard heatsinks and an array of hybrid fan headers to ensure your rig stays cool and stable under intense workloads. A VRM heatsink with a thermal pad underneath improves heat transfer from the MOSFETs and chokes for better cooling performance.

Build on a Solid Foundation

The Prime B550M-A WIFI II provides all the fundamentals to boost daily productivity, so your system will be ready for action with stable power, intuitive cooling and flexible transfer options. The PCIe 4.0 x16 slot handles modern graphics cards, while the PCIe 4.0 M.2 slot supports up to 22110 NVMe SSDs with RAID support for an incredible performance boost — up to 64Gbps with Ryzen 5000 and 3000 Series processors — alongside a second PCIe 3.0 M.2 slot and four SATA 6Gb/s ports with RAID 0/1/10. DDR4 memory scales to 4866MHz (OC) with up to 128GB across four dual-channel DIMM slots.

Little Things Make a Big Difference

Prime B550 series adds the nuanced details that improve every experience. Outstanding Realtek 7.1-channel audio features audio shielding separating analog and digital signal domains, a separate PCB layer for left and right tracks ensuring minimal crosstalk, and premium audio capacitors for exceptional fidelity, with an S/PDIF header for expansion. ASUS 5X Protection III provides DIGI+ VRM, LANGuard, overvoltage protection, SafeSlot Core and a stainless-steel back I/O, while Aura Sync RGB and addressable Gen 2 headers let you create a uniquely personal look.

Connectivity

Built-in 2×2 Wi-Fi 6 (802.11ax) delivers high-speed wireless on 2.4/5GHz bands with Bluetooth 5.2, while Realtek 1Gb Ethernet provides dependable wired networking. The rear panel offers two USB 3.2 Gen 2 ports at 10Gbps and four USB 3.2 Gen 1 ports, with a PS/2 combo connector for legacy peripherals and front-panel USB headers adding case connectivity. Triple display outputs — HDMI 2.1 (4K@60Hz), DVI-D and D-Sub — cover every monitor generation, and Armoury Crate with Aura Sync and AI Suite 3 with TurboV EVO provide complete software control.

Key Features

• AMD AM4 socket for Ryzen 5000 Series / 5000 G-Series / 4000 G-Series / 3000 Series
• AMD B550 chipset · PCIe 4.0 ready
• 4x DDR4 DIMM, Dual Channel, Max 128GB, DDR4 4866 (OC)
• 1x PCIe 4.0 x16 + 2x PCIe 3.0 x1
• 2x M.2 (1x PCIe 4.0 x4/SATA up to 22110 + 1x PCIe 3.0 x4/SATA) + 4x SATA 6Gb/s, RAID 0/1/10
• Wi-Fi 6 2×2 (802.11ax) + Bluetooth 5.2, ASUS Wi-Fi moving antennas
• Realtek 1Gb Ethernet
• 2x USB 3.2 Gen 2 (10Gbps) + 4x USB 3.2 Gen 1 rear + PS/2 combo
• HDMI 2.1 (4K@60Hz) + DVI-D + D-Sub display outputs
• Realtek 7.1 HD Audio, premium capacitors, S/PDIF header
• Fan Xpert 2+, AI Suite 3, TurboV EVO, EPU, UEFI BIOS
• ASUS 5X Protection III, SafeSlot Core, Aura Sync RGB

Spec Sheet

Perfect For

• Compact Ryzen 5000 Series builds and upgrades on the proven AM4 platform
• Office and home PCs needing Wi-Fi 6 without add-in cards
• Systems connected to older D-Sub or DVI monitors
• Budget gaming builds wanting PCIe 4.0 graphics and NVMe storage

What’s Included

• PRIME B550M-A WIFI II motherboard
• 1x ASUS Wi-Fi moving antennas
• 1x I/O shield
• 2x SATA 6Gb/s cables
• 1x Support DVD
• M.2 SSD screw package
• User manual

Compact AM4 done right — PCIe 4.0 graphics and storage, DDR4 4866 (OC), Wi-Fi 6 and triple display outputs on the ASUS PRIME B550M-A WIFI II, built to ASUS 5X Protection III standards.