Description

ASUS Prime B550M-A WiFi II AMD AM4 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
Model
Brand ASUS
Model PRIME B550M-A WIFI II
Part Number 90MB19X0-M0AAY0
Supported CPU
CPU Socket Type AM4
CPU Type Supports AMD Ryzen 5000 Series / 5000 G-Series / 4000 G-Series / 3000 Series Processors

* Refer to www.asus.com for CPU support list.
Chipsets
Chipset AMD B550
Memory
Number of Memory Slots 4x288pin (DDR4)
Memory Standard 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*

* Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists), and memory frequency support depends on the CPU types.
Maximum Memory Supported 128GB
Channel Supported Dual Channel
ECC Supported ECC memory (ECC mode) support varies by CPU
Buffer Supported Un-buffered
Expansion Slots
PCI Express 4.0 x16 1 x PCI Express 4.0 x16*

* Actual support may vary by CPU.
PCI Express x1 2 x PCIe 3.0 x1
Storage Devices
SATA 6Gb/s 4 x SATA 6Gb/s
M.2 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 5000 G-Series/ 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)
SATA RAID 0/1/10
Onboard Video
Onboard Video Chipset Supported only by CPU with integrated graphic
Onboard Audio
Audio Chipset Realtek 7.1 Surround Sound High Definition Audio CODEC
Audio Channels 7.1 Channels*

* A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
Onboard LAN
LAN Chipset Realtek 1Gb Ethernet
Max LAN Speed 1Gbps
Wireless LAN Wi-Fi 6
802.11 a/b/g/n/ac/ax
Bluetooth Bluetooth 5.2
Rear Panel Ports
Back 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
Onboard 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
Other 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
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
Physical Spec
Form Factor Micro ATX
LED Lighting RGB
Dimensions (W x L) 9.6″ x 9.6″
Power Pin 1 x 24-pin Main Power connector
1 x 8-pin +12V Power connector
Windows 11 Compatibility
Windows 11 Ready
Features
Features 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

Operating System:
Windows 11 64-bit, Windows 10 64-bit
Packaging
Package Contents 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