ASUS
ASUS MB PRIME B550M-A AC AMD B550 AM4 Max.128GB DDR4 PCIe mATX Retail
Mfg Part Number: PRIME B550M-A AC , Item #: 4451606
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Price: $153.90
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Last Updated: Dec 22, 2025
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AMD AM4 mATX motherboard with PCIe 4.0, dual M.2, WiFi, HDMI, D-Sub, DVI, SATA 6 Gbps, USB 3.2 Gen 2 ports, 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 a vast portfolio of compatible PC gear, including addressable RGB strips
ASUS Prime series is expertly engineered to unleash the full potential of 3rd Generation AMD Ryzen platform. Boasting a robust power design, comprehensive cooling solutions and intelligent tuning options, Prime B550 series motherboards provide daily users and DIY PC builders a range of performance tuning options via intuitive software and firmware features.
Tune It Your Way
Comprehensive controls form the foundation of the ASUS Prime series. The Prime B550 motherboard packs flexible tools to tune every aspect of your system, enabling you to tweak performance settings to perfectly match the way you work - maximizing your productivity.
Main Specification
| General Information | |
| Manufacturer | ASUS Computer International |
| Manufacturer Part Number | PRIME B550M-A AC |
| Manufacturer Website Address | http://usa.asus.com |
| Brand Name | Asus |
| Product Line | Prime |
| Product Model | B550M-A AC |
| Product Name | Prime B550M-A AC Desktop Motherboard |
| Product Type | Desktop Motherboard |
| Processor & Chipset | |
| Chipset Manufacturer | AMD |
| Chipset Model | B550 |
| Total Processor Supported | 1 |
| Processor Socket | Socket AM4 |
| Processor Supported | Ryzen 9 |
| Processor Supported | Ryzen 5 Pro |
| Processor Supported | Ryzen 9 PRO |
| Processor Supported | Ryzen 7 PRO |
| Processor Supported | Ryzen 7 |
| Processor Supported | Ryzen 3 |
| Processor Supported | Ryzen 5 |
| Processor Supported | Ryzen 3 PRO |
| Memory | |
| Number of Memory Slots | 4 |
| Memory Form Factor | UDIMM |
| Memory Form Factor | DIMM |
| Maximum Memory Supported | 128 GB |
| Memory Technology | DDR4 SDRAM |
| Memory Speed Supported | 2133 MHz |
| Memory Speed Supported | 3866 MHz |
| Memory Speed Supported | 4400 MHz |
| Memory Speed Supported | 4333 MHz |
| Memory Speed Supported | 2800 MHz |
| Memory Speed Supported | 2400 MHz |
| Memory Speed Supported | 4000 MHz |
| Memory Speed Supported | 3733 MHz |
| Memory Speed Supported | 3600 MHz |
| Memory Speed Supported | 2666 MHz |
| Memory Speed Supported | 3000 MHz |
| Memory Speed Supported | 3400 MHz |
| Memory Speed Supported | 4200 MHz |
| Memory Speed Supported | 4266 MHz |
| Memory Speed Supported | 3200 MHz |
| Memory Speed Supported | 3466 MHz |
| Memory Speed Supported | 4133 MHz |
| Memory Speed Supported | 4466 MHz |
| Memory Speed Supported | 4600 MHz |
| Memory Speed Supported | 4800 MHz |
| Memory Speed Supported | 4866 MHz |
| Memory Speed Supported | 3333 MHz |
| I/O Controller | |
| Controller Type | Serial ATA/600 |
| RAID Supported | Yes |
| RAID Levels | 1 |
| RAID Levels | 0 |
| RAID Levels | 10 |
| Video | |
| Onboard Video | CPU Dependent Video |
| Audio | |
| Audio Channels | 7.1 |
| Network & Communication | |
| Bluetooth | Yes |
| Gigabit Ethernet | Yes |
| Wireless LAN | Yes |
| Wireless LAN Standard | IEEE 802.11a/b/g/n/ac |
| I/O Expansions | |
| Total Number of Expansion Slots | 3 |
| Total Number of PCI Express Slots | 3 |
| Number of PCI Express x1 Slots | 2 |
| Number of PCI Express x16 Slots | 1 |
| Interfaces/Ports | |
| Total Number of USB Ports | 6 |
| Number of USB 3.2 Ports | 6 |
| VGA | Yes |
| HDMI | Yes |
| DVI | Yes |
| Number of Network (RJ-45) Ports | 1 |
| Onboard Interfaces | |
| Number of SATA Interfaces | 4 |
| Number of M.2 Interfaces | 2 |
| Total Number of Onboard USB Ports | 6 |
| Number of Onboard USB 2.0 Ports | 4 |
| Number of Onboard USB 3.2 Ports | 2 |
| Onboard S/PDIF Header | Yes |
| Physical Characteristics | |
| Form Factor | Micro ATX |
| Width | 9.6" |
| Depth | 9.6" |
| Miscellaneous | |
| Country of Origin | China |
| Environmentally Friendly | Yes |
| Environmental Compliance | Restriction of Hazardous Substances (RoHS) |
WARNING:: The plastic used in cable products can expose you to lead and lead components,
chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information go to www.P65Warnings.ca.gov
