AMD B550 (Ryzen AM4) micro ATX motherboard with dual M.2, PCIe 4.0, Wi-Fi 6, 1 Gb Ethernet, HDMI, DVI-D, D-Sub, SATA 6 Gbps, USB 3.2 Gen 2 Type-A, and Aura Sync RGB lighting support
AMD AM4 Socket: Ready for Ryzen™ 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series Desktop Processors
Comprehensive Cooling: VRM heatsink, PCH heatsink, hybrid fan headers, and Fan Xpert 2+ utility
Ultrafast Connectivity: Dual M.2, PCIe 4.0, Wi-Fi 6, 1 Gb Ethernet, USB 3.2 Gen 2 Type-A support
Aura Sync RGB Lighting: Onboard addressable Gen 2 header and RGB headers for RGB LED strips, easily synced with Aura Sync-capable hardware

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
  2x2 Wi-Fi 6 (802.11 a/b/g/n/ac/ax) + BT5.2
  Wi-Fi 6
  2x2 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