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Green rectangular micro ATX board with black slots and silver heatsinks

ASUS

ASUS PRO B550M-C/CSM AMD motherboard

SKU CH-3GAG-95E57 MPN PRO B550M-C/CSM

Micro-ATX AMD B550 board with AM4 socket, four DDR4 slots up to 128 GB, PCIe 4.0 x16, one M.2 2280, four SATA 6 Gb/s and Realtek ALC887/897 audio

  • CPU Socket TypeAM4
  • CPU TypeAMD AM4 Socket for AMD Ryzen 5000 Series / 4000 G-Series / 3
  • ChipsetAMD B550
  • Number of Memory Slots4x288pin (DDR4)
  • Memory StandardAMD Ryzen 5000 Series/3000 Series Desktop Processors DDR4 46
  • Maximum Memory Supported128GB
  • Supports AMD Ryzen 5000 and 3000 Series processors via AM4 socket
  • DDR4 memory up to 4600 MHz overclocked with four slots for 128 GB total
  • PCIe 4.0 x16 slot for high-speed graphics on Ryzen 5000 and 3000 CPUs
  • M.2 socket with PCIe 4.0 x4 and SATA modes for fast storage
  • Realtek ALC887/897 audio with HDMI 2.1 and dual DisplayPort video outputs

AM4 Micro-ATX Motherboard for Ryzen 5000.

The ASUS PRO B550M-C/CSM is a Micro-ATX board built around the AMD B550 chipset and an AM4 socket. It accepts Ryzen 5000 Series, 4000 G-Series and 3000 Series desktop processors. Four 288-pin DDR4 slots support dual-channel memory up to 128 GB. The layout includes one PCIe 4.0 x16 slot, one PCIe 3.0 x16 slot, one PCIe 3.0 x4 slot and a legacy PCI slot.

Thermals Noise and Power Draw in Normal Use

The board draws power through standard ATX and 8-pin EPS connectors to feed the CPU and memory. VRM heatsinks cover the power phases to dissipate heat during typical workloads. Fan headers let the system adjust speeds based on temperature, keeping acoustic output low at idle and moderate under load. No liquid-cooling or specialised thermal interfaces are included.

M.2 Slot SATA Ports and Onboard Video Outputs

A single M.2 socket 3 with M key accepts 2242, 2260 or 2280 drives in PCIe 4.0 x4 or SATA mode depending on the installed CPU. Four SATA 6 Gb/s ports support RAID 0, 1 and 10 arrays. When a processor with integrated graphics is used, one HDMI 2.1 port and two DisplayPort connectors drive displays up to 4K at 60 Hz. Realtek ALC887/897 audio handles analogue output.

Points forts

  • Supports AMD Ryzen 5000 and 3000 Series processors via AM4 socket
  • DDR4 memory up to 4600 MHz overclocked with four slots for 128 GB total
  • PCIe 4.0 x16 slot for high-speed graphics on Ryzen 5000 and 3000 CPUs
  • M.2 socket with PCIe 4.0 x4 and SATA modes for fast storage
  • Realtek ALC887/897 audio with HDMI 2.1 and dual DisplayPort video outputs

Caractéristiques

BrandASUS
ModelPRO B550M-C/CSM
CPU Socket TypeAM4
CPU TypeAMD AM4 Socket for AMD Ryzen 5000 Series / 4000 G-Series / 3000 Series Desktop Processors *
* Refer to www.asus.com for CPU support list
ChipsetAMD B550
Number of Memory Slots4x288pin (DDR4)
Memory StandardAMD Ryzen 5000 Series/3000 Series Desktop 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 *
AMD Ryzen 4000 G-Series Desktop 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 Supported128GB
Channel SupportedDual Channel
Memory Performance ProfileIntel XMP 2.0
PCI Express 4.0 x16AMD Ryzen 5000 Series/3000 Series Desktop Processors
1 x PCIe 4.0 x16 (x16 mode) *
AMD Ryzen 4000 G-Series Desktop Processors
1 x PCIe 3.0 x16 (x16 mode)
* Support PCIe bifurcation for RAID on CPU function.
PCI Express 3.0 x161 x PCI Express 3.0 x16
PCI Express x16None
PCI Express x4AMD B550 Chipset
1 x PCIe 3.0 x4 *
* The PCIe x4 slot runs x2 mode when the PCI slot is occupied.
PCI Slots1 x PCI Slot
Serial ATA (SATA)4 x SATA 6Gb/s
M.2AMD Ryzen 5000 Series/3000 Series Desktop Processors:
1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280 (PCIE 4.0 x4 and SATA modes) storage devices support
AMD Ryzen 4000 G-Series Processors:
1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280 (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 RAID0/1/10
Onboard Video ChipsetSupported only by CPU with integrated graphic:
2 x DisplayPort
1 x HDMI 2.1 (4K@60HZ)
* Graphics specifications may vary between CPU types.
Audio ChipsetRealtek ALC887/897
Audio Channels7.1 Channels
* Choose the chassis with HD audio module in front panel to support 8-channel audio output.
LAN ChipsetRealtek RTL8111H
Max LAN Speed1Gbps
Back I/O Ports1 x Realtek RTL8111H
1 x PS/2 keyboard (purple)
1 x PS/2 mouse (green)
2 x DisplayPort
1 x HDMI
2 x USB 3.2 Gen 2 (1 x Type-A+1 x USB Type-C)
2 x USB 3.2 Gen 1 Type-A
2 x USB 2.0
3 x Audio jack(s)
HDMI1 x HDMI
USB 3.02 x USB 3.0
Onboard USB2 x USB 3.2 Gen 1(up to 5Gbps) connector(s) support(s) additional 4 USB 3.2 Gen 1 port(s)
2 x USB 2.0 connector(s) support(s) additional 3 USB 2.0 port(s)
Other Connectors1 x CPU Fan connector(s)
2 x Chassis Fan connector(s)
1 x LPT header
1 x Thunderbolt header(s)
1 x Front panel audio connector(s) (AAFP)
1 x SMBus header(s)
1 x System panel(s)
1 x Clear CMOS jumper(s)
1 x COM port header
1 x Chassis intrusion header
1 x LPC Debug header
1 x Speaker connector
Form FactorMicro ATX
LED LightingNone RGB
Dimensions (W x L)9.6" x 9.6"
Power Pin1 x 24-pin EATX Power connector(s)
1 x 8-pin EATX 12V Power connectors
Windows 11Supported
FeaturesSoftware Features:
ASUS Exclusive Software
IT Management software supported
- ASUS Control Center Express (ACCE)
ASUS Special Features:
ASUS Q-Design
- ASUS Q-DIMM
- ASUS Q-Slot
ASUS Thermal Solution
- Aluminum heatsink design
ASUS EZ DIY
- Box Headers
Bespoke Motherboard Design & Business Focused Features
- ASUS Self Recovering BIOS
- ASUS Event Log
- ASUS Commercial BIOS kit
- Anti-Moisture
- 24/7 Reliability
- Overcurrent Protection
TPM2.0 IC Onboard
BIOS:
256MB Flash ROM, UEFI AMI BIOS
Manageability:
WOL by PXE
Operating System:
Windows 10 64-bit
Package ContentsAccessories:
1 x ACC Express Activation Key Card
I/O Shield
2 x SATA 6Gb/s cable(s)
1 x Supporting DVD
User manual
3 x M.2 SSD screw package(s)
2 x M.2 SSD Hex screw packages
Poids d’expédition0.91 kg
Dimensions du colis269 × 263 × 52 mm

Questions sur cet article

How do I install the CPU into the AM4 socket without bending pins?

Lift the retention arm, align the gold triangle on the Ryzen processor with the socket corner, place it gently without pressure, lower the arm and lock it; the common mistake is forcing the chip before the arm is fully open.

Which component on the PRO B550M-C/CSM will need replacement first over the years?

The Realtek ALC887/897 audio codec and the CMOS battery are the only parts that typically age; capacitors are solid-state and the board has no mechanical drives.

What thermal limit appears first when the VRM runs sustained heavy loads?

The 4+2 phase power delivery reaches its current rating before the chipset heatsink saturates, so VRM temperature becomes the limiting factor under continuous all-core workloads.

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