ASUS Prime series is expertly engineered to unleash the full potential of 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series 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.
All-around Energy Efficiency
With the Energy Processing Unit (EPU), you’ll enjoy system-wide power savings. The EPU automatically optimizes power consumption and maximizes savings with Away mode.
Flexible Cooling Controls
Fan Xpert 2+ software provides comprehensive control over system fans. Auto-Tuning mode intelligently configures all parameters with a single click. There’s also an Extreme Quiet mode that reduces chassis fan speeds to below the default minimum to keep your system whisper-quiet when performing light tasks. Fans can also be controlled via the UEFI BIOS.
Precise Digital Power Control
The Digi+ voltage-regulator module (VRM) delivers real-time control over voltage droop, automatically switching frequency and power-efficiency settings. It also allows you to fine-tune your CPU for ultimate stability and performance.
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.
VRM Heatsink and Thermal Pads
A VRM heatsink with underneath thermal pad improves heat transfer from the MOSFETs and chokes for better cooling performance.
Cooler by Design
Prime B550 series features comprehensive cooling controls that are configurable via Fan Xpert 2+ software or via the UEFI BIOS.
Build on a Solid Foundation
Prime B550 motherboard 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.
PCIe 4.0 M.2
Achieve speed with onboard M.2
PCIe 4.0 M.2 Slot supports up to 22110 and provide NVMe SSD RAID support for an incredible performance boost. Create a RAID configuration with up to PCIe 4.0 storage device to enjoy the fastest data-transfer speeds on AMD Ryzen™ 5000 Series/ 3000 Series Processors.
Wi-Fi 6
Wi-Fi 6 module is compatible with the 802.11ax standard and pushes theoretical peak bandwidth up to an incredible 1.2 Gbps. Perhaps more importantly for power users, it’s optimized for more efficient operation on crowded networks with a lot of competing traffic. Pair your motherboard with ASUS WiFi 6 routers to fully experience the networking potential of WiFi 6.
Little Things Make a Big Difference
Prime B550 series adds the nuanced details that improve every experience, from exclusive codecs that provide pristine audio quality to intuitive RGB lighting controls that let you customize your system to create a uniquely personal look.
Aura Sync
Outshine the Competition
A well-tuned enthusiast system deserves a matching aesthetic. ASUS Aura offers full RGB lighting control with a variety of functional presets for RGB LED strips connected to the onboard RGB headers. And it can all be synced with an ever-growing portfolio of Aura-capable hardware.
SafeSlot Core
Fortified PCIe slot prevents damage
SafeSlot Core is the ASUS-exclusive PCIe slot. Featuring a fortified design that’s anchored to the motherboard by a special hook, SafeSlot Core provides 1.6x stronger retention and 1.3x greater shearing resistance than standard expansion slots.
Overvoltage Protection
World-class circuit-protecting power design
An exclusive circuit design with built-in voltage regulators to protect your motherboard from damage caused by unexpected high-level voltages from unstable or inferior power supplies.
DRAM Overcurrent Protection
Short-circuit damage prevention
Onboard resettable fuses prevent overcurrent and short-circuit damage. This extends beyond I/O ports to DRAM to safeguard the lifespan of your system and connected devices.
Stainless-Steel Back I/O
3X corrosion-resistance for greater durability
Corrosion-resistant stainless-steel back I/O panels bonded with chromium oxide have a lifespan that’s three times longer than ordinary panels.
LANGuard
Pumped-up throughput 2.5X higher surge tolerance
ASUS LANGuard is a hardware-level network protection feature that integrates advanced signal-coupling technology and premium anti-EMI surface-mounted capacitors to improve throughput and ensure a more reliable connection.
SPECIFICATIONS:
| Model | PRIME B550M-A WIFI II |
| CPU | AMD Ryzen™ 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series Desktop Processors |
| *Refer to www.asus.com for CPU support list. | |
| Chipset | B550 |
| Memory | 4 x DIMM, Max. 128GB, DDR4 4866(OC)/4800(OC)/4600(OC)/4466(OC)/ 4400(OC)/4333(OC)/4266(OC)/4200(OC)/ 4133(OC)/4000(OC)/3866(OC)/3733(OC)/ 3600(OC)/3466(OC)/3400(OC)/3333(OC)/ 3200/3000/2933/2800/2666/2400/2133, Un-buffered Memory* |
| Dual Channel Memory Architecture | |
| * ECC memory (ECC mode) support varies by CPU. | |
| * Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists), and memory frequency support depends on the CPU types. | |
| Graphics | 1 x D-Sub port |
| 1 x DVI-D port | |
| 1 x HDMI® port** | |
| * Graphics specifications may vary between CPU types. | |
| ** Supports 4K@60Hz as specified in HDMI 2.1. | |
| Expansion Slots | AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors |
| 1 x PCIe 4.0 x16 slot (supports x16 mode) | |
| AMD Ryzen™ 5000 G-Series/ 4000 G-Series Desktop Processors | |
| 1 x PCIe 3.0 x16 slot (supports x16 mode) | |
| AMD B550 Chipset | |
| 2 x PCIe 3.0 x1 slots | |
| Storage | Supports 2 x M.2 slots and 4 x SATA 6Gb/s ports |
| AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors | |
| M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 4.0 x4 & SATA modes) | |
| AMD Ryzen™ 4000 G-Series Desktop Processors | |
| M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 3.0 x4 & SATA modes) | |
| AMD B550 Chipset | |
| M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 3.0 x4 & SATA modes) | |
| 4 x SATA 6Gb/s ports | |
| Support RAID 0, 1, 10 | |
| Ethernet | 1 x Realtek 1Gb Ethernet |
| ASUS LANGuard | |
| Wireless & Bluetooth | 2×2 Wi-Fi 6 (802.11 a/b/g/n/ac/ax) + BT5.2 |
| Wi-Fi 6 | |
| 2×2 Wi-Fi 6 (802.11 a/b/g/n/ac/ax) | |
| Supports 2.4/5GHz frequency band | |
| Bluetooth v5.2 | |
| USB | Rear USB:Total 6 ports |
| 2 x USB 3.2 Gen 2 ports (2 x Type-A) | |
| 4 x USB 3.2 Gen 1 ports (4 x Type-A) | |
| Front USB:Total 6 ports | |
| 1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports | |
| 2 x USB 2.0 headers support additional 4 USB 2.0 ports | |
| Audio | Realtek 7.1 Surround Sound High Definition Audio CODEC* |
| – Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking | |
| – Supports up to 24-Bit/192 kHz playback | |
| Audio Features | |
| – Audio Shielding | |
| – LED-illuminated audio trace path design | |
| – Premium audio capacitors | |
| – Dedicated audio PCB layers | |
| * A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output. | |
| Back Panel I/O Ports | 2 x USB 3.2 Gen 2 ports (2 x Type-A) |
| 4 x USB 3.2 Gen 1 ports (4 x Type-A) | |
| 1 x D-Sub port | |
| 1 x DVI-D port | |
| 1 x HDMI® port | |
| 1 x Wi-Fi Module | |
| 1 x Realtek 1Gb Ethernet port | |
| 3 x Audio jacks | |
| 1 x PS/2 Keyboard/Mouse combo port | |
| Internal I/O Connectors | Fan and Cooling related |
| 1 x 4-pin CPU Fan header | |
| 1 x 4-pin CPU OPT Fan header | |
| 2 x 4-pin Chassis Fan headers | |
| Power related | |
| 1 x 24-pin Main Power connector | |
| 1 x 8-pin +12V Power connector | |
| Storage related | |
| 2 x M.2 slots (Key M) | |
| 4 x SATA 6Gb/s ports | |
| USB | |
| 1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports | |
| 2 x USB 2.0 headers support additional 4 USB 2.0 ports | |
| Miscellaneous | |
| 1 x Addressable Gen 2 header | |
| 2 x AURA RGB headers | |
| 1 x Clear CMOS header | |
| 1 x COM Port header | |
| 1 x Front Panel Audio header (AAFP) | |
| 1 x S/PDIF Out header | |
| 1 x Speaker header | |
| 1 x SPI TPM header (14-1pin) | |
| 1 x 10-1 pin System Panel header | |
| Special Features | ASUS 5X PROTECTION III |
| – DIGI+ VRM | |
| – LANGuard | |
| – Overvoltage Protection | |
| – SafeSlot Core | |
| – Stainless-Steel Back I/O | |
| ASUS Q-Design | |
| – Q-DIMM | |
| – Q-Slot | |
| ASUS Thermal Solution | |
| – VRM heatsink design | |
| AURA Sync | |
| – AURA RGB headers | |
| – Addressable Gen 2 header | |
| Software Features | ASUS Exclusive Software |
| Armoury Crate | |
| – AURA Creator | |
| – AURA Sync | |
| AI Suite 3 | |
| – Performance and Power Saving Utility | |
| TurboV EVO | |
| EPU | |
| DIGI+ VRM | |
| Fan Xpert 2+ | |
| – EZ update | |
| – Lighting Control | |
| ASUS CPU-Z | |
| AI Charger | |
| DAEMON Tools | |
| MyASUS | |
| Norton Anti-virus software (Free Trial version) | |
| WinRAR | |
| UEFI BIOS | |
| ASUS EZ DIY | |
| – ASUS CrashFree BIOS 3 | |
| – ASUS EZ Flash 3 | |
| – ASUS UEFI BIOS EZ Mode | |
| BIOS | 256 Mb Flash ROM, UEFI AMI BIOS |
| Manageability | WOL by PME, PXE |
| Accessories | Cables |
| 2 x SATA 6Gb/s cables | |
| Miscellaneous | 1 x ASUS Wi-Fi moving antennas |
| 1 x I/O Shield | |
| 1 x M.2 SSD screw package | |
| Installation Media | |
| 1 x Support DVD | |
| Documentation | |
| 1 x User manual | |
| Operating System | Windows® 11, Windows® 10 64-bit |
| Form Factor | microATX |
| 24.4cm x 24.4cm |
