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ASUS PRIME B550M-A AC AMD AM4 mATX motherboard with impressive features, including PCIe 4.0, dual M.2 slots, WiFi, HDMI, D-Sub, DVI, SATA 6 Gbps, USB 3.2 Gen 2 ports, and Aura Sync RGB lighting
- AMD AM4 socket: Ready for Ryzen™ 5000 Series/4000 G-Series/3000 Series Desktop Processors
- Comprehensive cooling: VRM heatsink, PCH heatsink, Fan Xpert 2+
- Ultrafast connectivity: Dual M.2, PCIe 4.0, 802.11ac Wi-Fi, USB 3.2 Gen 2 Type-A
- Aura Sync RGB: Synchronizable LED effects across compatible PC gear
- Audio Features: LED-illuminated design, Audio Shielding, Premium Japanese Audio Capacitors, Dedicated Audio PCB Layers
- DIGI+ VRM & EPU support
- DDR4 memory support
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Overview
Specs
Reviews (17)
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 3 years
- Limited Warranty period (labor): 3 years
- Read full details
Return Policies
- Return for refund until: January 31, 2027
- Return for replacement until: January 31, 2027
- This item is covered by Newegg.ca's Extended Holiday Return Policy.
- Read full return policy for details.
We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2026 and December 31, 2026 you will have until January 31, 2027 to return your product.
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 AC is a micro-ATX AM4 motherboard for builders using compatible AMD Ryzen 5000, 5000 G-Series, 4000 G-Series, or 3000 Series processors. It combines DDR4 support, PCIe 4.0, dual M.2 slots, Wi-Fi 5, and Bluetooth 5.0 for compact everyday or gaming PCs.
Recommended For
- Builders putting together a compact micro-ATX gaming PC around a supported mainstream Ryzen processor and one graphics card; testing of the closely related B550M-A Wi-Fi board found gaming performance in line with other B550 boards.
- AM4 upgraders reusing DDR4 memory who want a supported Ryzen 3000, 4000 G-Series, or 5000-series processor; check ASUS’s CPU support list for the exact chip and required BIOS version before building.
- Home-office or everyday desktop builders who need a wired or 802.11ac Wi-Fi connection and standard HDMI, DVI-D, or VGA display outputs; video outputs work only with a processor that has integrated graphics.
- PC builders planning a two-drive M.2 setup, with room for additional SATA storage, who want to keep the system compact rather than choosing a full-size ATX board.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Ryzen AM4 desktop builds using DDR4 memory, with onboard Wi-Fi and room for M.2 or SATA storage |
| Processor And Chipset Compatibility | AMD B550 chipset with an AM4 socket; supports Ryzen 5000, 5000 G-Series, 4000 G-Series and 3000 Series processors, with exact support depending on the CPU support list |
| Memory Configuration | Four DDR4 memory slots support up to 128GB in dual-channel mode, with speeds up to DDR4-4866 (OC); ECC mode support varies by CPU |
| Expansion Slots | One PCIe 4.0 x16 slot, one PCIe 3.0 x16 slot and two PCIe 3.0 x1 slots; PCIe 4.0 support may vary by CPU |
| Storage And RAID | Two M.2 sockets support PCIe and SATA-mode drives; the first supports up to PCIe 4.0 x4 with Ryzen 5000 or 3000 desktop processors, and PCIe 3.0 x4 with Ryzen 5000 G-Series or 4000 G-Series processors. Four SATA 6Gb/s ports support RAID 0, 1 and 10 |
| Networking | 802.11a/b/g/n/ac Wi-Fi, Bluetooth 5.0 and 1Gbps Ethernet |
| Rear I/O And Internal Connectivity | Rear I/O includes HDMI, DVI-D, D-Sub, two USB 3.2 Gen 2 Type-A ports, four USB 3.2 Gen 1 Type-A ports, RJ45, PS/2, three audio jacks and a Wi-Fi module. Internal headers provide additional USB 3.2 Gen 1 and USB 2.0 ports, plus S/PDIF, TPM, COM and front-panel connections |
| Audio | Realtek ALC887/897 audio supports up to 7.1-channel output; a chassis with an HD audio front-panel module is required for 7.1-channel output |
| Cooling And RGB | Fan headers include CPU, CPU OPT and chassis connections; RGB connections include two Aura RGB strip headers and one Addressable Gen 2 header |
| Power And Form Factor | Micro ATX board measuring 9.6 × 9.6 inches, with 24-pin EATX and 8-pin EATX 12V power connectors |
| BIOS And Board Features | 256Mb Flash ROM with UEFI BIOS; includes ASUS EZ Flash 3, CrashFree BIOS 3, Aura Sync and Fan Xpert 2+ |
| Model Identifiers | ASUS PRIME B550M-A AC |