ASUS PRIME B550M-A/CSM Motherboard

ASUS Prime B550M-A/CSM AMD AM4 PCIe 4.0 HDMI 2.1/D-Sub microATX

ASUS Prime B550M-A/CSM AMD AM4 PCIe 4.0 HDMI 2.1/D-Sub microATX

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  • 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-C & 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

Specifications Overview

Model PRIME B550M-A/CSM
Release Date June 2020

* First availability for purchase, it may not correspond to the actual market launch date.

Socket AM4
Form factor Micro ATX
Chipset AMD B550
Supported Memory DDR4
2133Mhz 2400Mhz 2666Mhz 2800Mhz 3000Mhz 3200Mhz 3333Mhz 3466Mhz 3600Mhz 3733Mhz 3866Mhz 4000Mhz 4133Mhz 4266Mhz 4400Mhz 4600Mhz
* High clock speeds may require enabling the XMP profile in the motherboard BIOS
** RAM support may also depend on the CPU memory controller
ECC RAM Support
* ECC memory support also depends on the CPU memory controller
Audio Chipset Realtek ALC887
Audio Channels 7.1 Channels
LAN Chipset Realtek RTL8111H
Max LAN Speed 10/100/1000Mbps
SLI Support
CrossFire Support
RAID Support
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
Wireless LAN
PCI-Express x16 Slots 1
PCI-Express x4 Slots 0
PCI-Express x1 Slots 2
SATA 6 Gbps Ports 4
SATA Express Ports 0
M.2 Ports 2
M.2 Devices support
  • 2242 / 2260 / 2280 / 22110 - M Key
  • 2242 / 2260 / 2280 - M Key
RAM Slots 4
Maximum Supported RAM 128 GB
Onboard USB 2.0 2
Onboard USB 3.2 Gen 1 1
Onboard USB 3.2 Gen 2 0


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