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ASUS Prime B550M-A/CSM AMD AM4 (3rd Gen Ryzen) microATX Commercial Motherboard (PCIe 4.0, ECC Memory, 1Gb LAN, HDMI 2.1/D-Sub, 4K@60HZ, TPM, ASUS Control Center Express)

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BIOS update might require for AMD Zen 3 Ryzen 5000 series CPU
AMD AM4 Socket and PCIe 4.0: The perfect pairing for 3rd Gen AMD Ryzen CPUs
Fast Connectivity: 1Gb LAN, USB 3.2 Gen 2 Type-A ports, a front panel USB 3.2 Gen 1 connector, plus HDMI 2.1, D-Sub, and DVI display outputs
First PCIe 4.0 CSM motherboard: ASUS Corporate Stable Model with up to 36-month supply, EOL notice, and ECN control
ASUS Control Center Express (ACCE) to make IT endpoint management simpler
5X Protection III: all-round protection with LANGuard, DRAM overcurrent protection, overvoltage protection, SafeSlot Core safeguards and stainless-steel back I/O

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Overview

Specs

Model
Brand	ASUS
Model	PRIME B550M-A/CSM

Supported CPU
CPU Socket Type	AM4
CPU Type	BIOS update might require for AMD Zen 3 Ryzen 5000 series CPU. Refer to ASUS website for CPU support list.

Chipsets
Chipset	AMD B550

Memory
Number of Memory Slots	4x288pin (DDR4)
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

Windows 11 Compatibility
Windows 11	Supported

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

Additional Information
Date First Available	August 31, 2020

Warranty & Returns

Return for refund within: 30 days

Return for replacement within: 30 days

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