Features

CPU & Chipset

• Socket: AM4, compatible with Ryzen 5000 / 5000 G-Series / 4000 G-Series / 3000 series desktop processors.

• Chipset: AMD B550, enabling PCIe 4.0 for GPU and one M.2 slot when paired with a compatible CPU.

Memory

• Supports DDR4 memory (dual-channel) via 4 DIMM slots.

• Capacity up to 128 GB (depending on modules).

• Features ASUS memory tuning/bracing features to help stability at higher frequencies.

Expansion & Slots

• 1 × PCIe 4.0 ×16 slot (reinforced SafeSlot) for graphics cards.

• Additional PCIe lanes via chipset for expansion cards.

• Dual M.2 slots: one with PCIe 4.0 ×4 + SATA, the other with PCIe 3.0 or SATA modes.

Storage & I/O

• Four SATA 6 Gb/s ports for SSDs/HDDs.

• Rear display outputs include HDMI, DVI-D, and D-Sub for APU-based graphics.

• USB I/O: includes at least one USB 3.2 Gen2 Type-A, several USB3.2 Gen1, and USB2.0 ports (front and rear).

Networking & Wireless

• Integrated WiFi 6 for wireless connectivity.

• 1 Gbps Ethernet LAN port for wired networking.

Cooling & Thermal Design

• Heatsinks over VRM and chipset for better heat dissipation.

• Hybrid fan headers for system fans.

• Utilities provided (such as ASUS Fan Xpert) for managing fan curves and thermal response.

Other Features

• Aura Sync RGB lighting support (RGB headers + addressable Gen 2 header) for lighting control.

• ASUS “Prime” series build quality features: SafeSlot, overvoltage protection etc.

• BIOS with user-friendly interface and tuning tools.

Conclusion

The ASUS Prime B550M-A WiFi II offers a strong mix of modern features in a compact micro-ATX form. Its dual M.2, PCIe 4.0 support, built-in WiFi, and solid cooling make it ideal for Ryzen builds aimed at gaming or productivity without premium cost. It may lack extreme overclocking or multi-GPU ambition, but for most users it delivers excellent value and good future proofing.