Model

Brand

ASUS

Model

PRIME B550M-A

Supported CPU

CPU Socket Type

AM4

CPU Type

Build in AMD AM4 Socket for 3rd Gen AMD Ryzen and 3rd Gen AMD Ryzen with Radeon Graphics Processors *
* Refer to www.asus.com for CPU support list

Chipsets

Chipset

AMD B550

Memory

Number of Memory Slots

4×288pin

Memory Standard

3rd Gen AMD Ryzen Processors
DDR4 4600(O.C)/ 4400(O.C)/ 4266(O.C.)/ 4133(O.C.)/ 4000(O.C.)/ 3866(O.C.)/ 3733(O.C.)/ 3600(O.C.)/ 3466(O.C.)/ 3333(O.C.)/ 3200/ 3000/ 2800/ 2666/ 2400/ 2133 MHz Un-buffered Memory *
3rd Gen AMD Ryzen with Radeon Graphics Processors
DDR4 4800(O.C.)/ 4600(O.C)/ 4466(O.C.)/ 4400(O.C)/ 4266(O.C.)/ 4133(O.C.)/ 4000(O.C.)/ 3866(O.C.)/ 3733(O.C.)/ 3600(O.C.)/ 3466(O.C.)/ 3333(O.C.)/ 3200/ 3000/ 2800/ 2666/ 2400/ 2133 MHz Un-buffered Memory *
* Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).

Maximum Memory Supported

128GB

Channel Supported

Dual Channel

Expansion Slots

PCI Express 4.0 x16

3rd Gen AMD Ryzen Processors
1 x PCIe 4.0 x16 (x16 mode)
3rd Gen AMD Ryzen with Radeon Graphics Processors
1 x PCIe 3.0 x16 (x16 mode)

PCI Express x1

AMD B550 Chipset
2 x PCIe 3.0 x1 slots
* Support PCIe bifurcation for RAID on CPU function.

Storage Devices

SATA 6Gb/s

4 x SATA 6Gb/s

M.2

3rd Gen AMD Ryzen Processors:
1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280/22110 (PCIE 4.0 x4 and SATA modes) storage devices support
3rd Gen AMD Ryzen with Radeon Graphics Processors:
1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280/22110 (PCIE 3.0 x4 and SATA modes) storage devices support
AMD B550 Chipset:
1 x M.2_2 socket 3, with M Key, Type 2242/2260/2280 (PCIE 3.0 x4 and SATA modes) storage devices support

SATA RAID

0/1/10

Onboard Video

Onboard Video Chipset

Supported only by CPU with integrated graphic:
1 x D-Sub
1 x DVI-D
1 x HDMI 2.1 (4K@60HZ)

Onboard Audio

Audio Chipset

Realtek ALC887

Audio Channels

7.1 Channels
* A chassis with an HD audio module in the front panel is required to support 7.1-channel audio output.

Onboard LAN

LAN Chipset

Realtek RTL8111H

Max LAN Speed

10/100/1000Mbps

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 Realtek RTL8111H 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

1 x CPU Fan connector(s)
1 x CPU OPT Fan connector(s)
2 x Chassis Fan connector(s)
2 x Aura RGB Strip Headers
1 x Addressable Gen 2 header(s)
1 x SPI TPM header
1 x S/PDIF out header(s)
1 x Front panel audio connector(s) (AAFP)
1 x Clear CMOS jumper(s)
1 x System panel connector
1 x COM port header
1 x Speaker connector

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

Features

Features

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
ASUS CPU-Z
AI Charger
DAEMON Tools
Norton Anti-virus software (Free Trial for 60 days)
WinRAR
UEFI BIOS
ASUS EZ DIY
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 3
- ASUS UEFI BIOS EZ Mode

ASUS Special Features:
ASUS 5X PROTECTION III
- ASUS DIGI+ VRM
- ASUS LANGuard
- ASUS Overvoltage Protection
- ASUS SafeSlot Core
- ASUS Stainless-Steel Back I/O
ASUS Q-Design
- ASUS Q-DIMM
- ASUS Q-Slot
ASUS Thermal Solution
- Aluminum heatsink design
AURA Sync
- Standard RGB headers
- Addressable Gen 2 RGB header
ASUS Lighting Control 

BIOS:
256MB Flash ROM, UEFI AMI BIOS

Manageability:
WOL by PXE

Operating System:
Windows 10 64-bit