ASUS Prime B550M-A WiFi II Micro-ATX Motherboard for AMD AM4 Processors

CPU

AMD Ryzen™ 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series Desktop Processors

*Refer to www.asus.com for CPU support list.

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

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

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

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

Form Factor

24.4cm x 24.4cm