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ASUS Prime B550M-A WiFi II AMD AM4 (3rd Gen Ryzen) Micro ATX Motherboard (PCIe 4.0, WiFi 6, ECC Memory, 1Gb LAN, HDMI 2.1/D-Sub, 4K@60HZ, Addressable Gen 2 RGB Header and Aura Sync)
- AMD AM4 Socket and PCIe 4.0: The perfect pairing for 3rd Gen AMD Ryzen CPUs
- Ultrafast Connectivity: 1x PCIe 4.0 x16 SafeSlot, WiFi 6 (802.11ax), 1Gb LAN, dual M.2 slots (NVMe SSD) - one with PCIe 4.0 x4 connectivity, USB 3.2 Gen 2 Type-A, HDMI 2.1 (4K@60HZ), D-Sub & DVI
- Comprehensive Cooling: VRM heatsink, PCH heatsink, hybrid fan headers and Fan Xpert 2 utility
- 5X Protection III: all-round protection with LANGuard, DRAM overcurrent protection, overvoltage protection, SafeSlot Core safeguards and stainless-steel back I/O
- Boosted Memory Performance: ASUS OptiMem proprietary trace layout allows memory kits to operate at higher frequencies with lower voltages to maximize system performance
- Enhanced Power Solution: 8+1 DrMOS power stages with high-quality alloy chokes and durable capacitors to provide reliable power for the last AMD high-count-core CPUs
- Aura Sync RGB: Synchronizable LED effects across a wide range of compatible PC gear, plus RGB LED and Addressable Gen 2 RGB headers
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Overview
Specs
Reviews (61)
Powered by 3rd Gen AMD® Ryzen processors, the ASUS Prime B550M-A WiFi II delivers next-generation speeds with PCIe 4.0, WiFi 6 and 1Gb LAN. Boasting a robust power design, comprehensive cooling solutions and intelligent tuning options, the ASUS Prime B550M-A WiFi 6 provides mainstream PC users and DIY PC builders with a perfect all-around foundation via intuitive software and firmware features.
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 3 years
- Limited Warranty period (labor): 3 years
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Return Policies
- Return for refund within: 30 days
- Return for replacement within: 30 days
- This item is covered by Newegg.ca's Standard Return Policy.
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Manufacturer Contact Info
- Manufacturer Product Page
- Manufacturer Website
- Support Phone: 1-510-739-3777
- Support Website
- View other products from ASUS
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The ASUS Prime B550M-A WiFi II is a Micro-ATX AM4 motherboard for compatible AMD Ryzen 3000, 4000G, and 5000-series processors, suited to compact PC builds that need Wi-Fi 6, dual M.2 slots, and PCIe 4.0 support.
Recommended For
- AM4 builders assembling a compact Micro-ATX PC who want onboard Wi-Fi 6 and Bluetooth instead of using expansion slots for wireless networking.
- Ryzen gamers using a mainstream AM4 processor and a discrete graphics card who want a compact DDR4 platform with PCIe 4.0 support and two M.2 slots.
- Small home-server or workstation builders who want a Micro-ATX AM4 board with potential ECC memory support; ECC operation depends on the selected CPU, so verify processor support before buying.
- Builders reusing compatible AM4 Ryzen CPUs and DDR4 memory who want a board with wired Gigabit Ethernet, built-in Wi-Fi, and outputs for a compatible processor’s integrated graphics.
Real-World Use Scenarios
- Building a compact AM4 gaming PC? Pair the board with a compatible Ryzen CPU, a discrete graphics card, and DDR4 memory; the motherboard provides the platform and connections, while game performance depends mainly on the CPU, GPU, and cooling.
- Setting up a desktop away from the router? Built-in Wi-Fi 6 and Bluetooth let a compatible PC connect wirelessly without a separate network card; actual wireless performance depends on the router, signal, and local network conditions.
- Putting together a home or office PC for browsing, documents, and everyday multitasking? With a compatible AM4 processor and DDR4 memory, the board can support a Windows desktop with room for multiple M.2 or SATA drives; the processor and memory you choose determine how responsive it feels.
- Building a basic desktop without a separate graphics card? Use a compatible Ryzen G-Series processor with integrated graphics to connect a display through the motherboard’s HDMI, DVI-D, or VGA output; these video ports do not provide graphics when the CPU lacks integrated graphics.
- Refreshing an existing AM4 PC rather than replacing every component? This micro-ATX board may fit a compatible AM4/DDR4 parts-reuse build, but check ASUS’s CPU support list and the case’s motherboard-size support before buying.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | AM4 desktop PC builds using supported AMD Ryzen processors, DDR4 memory, PCIe expansion, and wired or Wi-Fi networking |
| Processor And Chipset | AMD B550 chipset with an AM4 socket; supports Ryzen 5000, 5000 G-Series, 4000 G-Series, and 3000 Series processors |
| Memory Configuration | Four DDR4 288-pin slots support up to 128GB in dual-channel mode; speeds range from DDR4-2133 to DDR4-3200 standard and up to DDR4-4866 overclocked, depending on CPU. Unbuffered memory, Intel XMP 2.0, and CPU-dependent ECC mode are supported |
| PCIe Expansion | Includes one PCIe 4.0 x16 slot, one PCIe 3.0 x16 slot, one PCIe 2.0 x16 slot, three PCIe x4 slots, two PCIe 3.0 x1 slots, and one PCI slot; graphics cards use a PCI Express interface |
| Storage And RAID | Two M.2 slots support PCIe and SATA modes, with the primary slot supporting up to PCIe 4.0 x4 with compatible processors; four SATA 6Gb/s ports support RAID 0, 1, and 10 |
| Networking And Wireless | Realtek 1Gb Ethernet plus Wi-Fi 6 (802.11a/b/g/n/ac/ax) and Bluetooth 5.2 |
| Rear I/O And Internal USB | Rear I/O has two USB 3.2 Gen 2 Type-A and four USB 3.2 Gen 1 Type-A ports; internal headers add two USB 3.2 Gen 1 and four USB 2.0 ports |
| Display Outputs | D-Sub, DVI-D, and HDMI outputs; onboard video is available only with a processor that has integrated graphics |
| Audio | Realtek 7.1-channel HD audio codec with three rear audio jacks; 7.1-channel output requires a chassis with a front-panel HD audio module |
| Cooling And RGB | VRM heatsink, one CPU fan header, one CPU optional fan header, two chassis fan headers, one Addressable Gen 2 header, and two AURA RGB headers |
| Power And Headers | 24-pin main power and 8-pin +12V power connectors; also includes Clear CMOS, COM, front-panel audio, S/PDIF out, speaker, SPI TPM, and system-panel headers |
| Form Factor And Dimensions | Micro ATX motherboard measuring 9.6 × 9.6 inches |
| Operating System Support | Supports 64-bit Windows 10 and Windows 11 |
| Model Identifiers | ASUS Prime; model PRIME B550M-A WIFI II; part number 90MB19X0-M0AAY0 |