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ASUS

Prime B850M-A-CSM

SKU31176MPN90MB1LQ0-MUVAYC
ProcessorAMD Socket AM5 for AMD Ryzen 9000 & 8000 & 7000 Series Desktop * Supports up to AMD 170W CPU * Refer to for CPU support list.
Memory256 GB DDR5
Storage6 GB
GraphicsDisplayPort** 1 x HDMI port***
OSWindows 11

Specifications 18 normalized

Processor
Processor
AMD Socket AM5 for AMD Ryzen 9000 & 8000 & 7000 Series Desktop Processors* Supports up to AMD 170W CPU * Refer to for CPU support list.
Chipset
AMD B850 Chipset
Memory & storage
Memory
4 x DIMM slots, max. 256 GB, DDR5 Supports up to 8000+MT/s (OC) with Ryzen 9000 & 8000 & 7000 Series Processors, ECC and Non-ECC Un-buffered DIMM* Dual channel memory architecture Supports AMD Extended Profiles for Overclocking (EXPO) ASUS Enhanced Memory Profile (AEMP) * Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information site or visit Adjustments will be made based on the specifications of mass-produced memory products available on the market. * Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.
Storage
Supports 3 x M.2 slots and 4 x SATA 6Gb/s ports AMD Ryzen 9000 & 7000 Series Desktop Processors M.2_1 slot (Key M), type 2280 (supports PCIe 5.0 x4 mode) M.2_2 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) AMD Ryzen 8000 Series Desktop Processors M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) M.2_2 slot (Key M), type 2280 (supports PCIe 4.0 x4/x2 mode)* AMD B850 Chipset M.2_3 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode) 4 x SATA 6Gb/s ports * Specifications vary by CPU types. AMD RAIDXpert2 Technology Ryzen 9000 Series Processors: RAID 0/1/5/10 Ryzen 8000 Series Processors: RAID 0/1 Ryzen 7000 Series Processors: RAID 0/1/10
Graphics
Graphics
2 x DisplayPort** 1 x HDMI port*** * Graphics specifications may vary between CPU types. Please refer to AMD CPU specifications. ** Supports max. 8K@30 Hz as specified in DisplayPort 1.4. *** Supports 4K@60 Hz as specified in HDMI 2.1.
Display
Back Panel I/O Ports
2 x USB 10Gbps ports (2 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) 2 x DisplayPort 1 x HDMI port 1 x Realtek 2.5Gb Ethernet port 3 x Audio jacks 1 x BIOS FlashBack button
Connectivity
Networking
1 x Realtek 2.5Gb Ethernet ASUS LANGuard
Expansion Slots
AMD Ryzen 9000 & 7000 Series Desktop Processors* 1 x PCIe 5.0 x16 slot (supports x16 mode) AMD Ryzen 8000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)** AMD B850 Chipset 1 x PCIe 4.0 x16 slot (supports x1 mode) * Please check the PCIe bifurcation table on the support site ( ** Specifications vary by CPU types. - To ensure compatibility of the device installed, please refer to for the list of supported
USB
Rear USB (Total 8 ports) 2 x USB 10Gbps ports (2 x Type-A ) 2 x USB 5Gbps ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) Front USB (Total 7 ports) 1 x USB 5Gbps connector (supports USB Type-C) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports * USB Type-C power delivery output: max. 5V/3A
Internal I/O Connectors
Fan and Cooling Related 1 x 4-pin CPU Fan header 1 x 4-pin CPU OPT Fan header 1 x 4-pin AIO Pump header 3 x 4-pin Chassis Fan headers Power Related 1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connectors 1 x 4-pin +12V CPU Power connectors Storage Related 3 x M.2 slots (Key M) 4 x SATA 6Gb/s ports USB 1 x USB 5Gbps connector (supports USB Type-C ) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports Miscellaneous 3 x Addressable RGB Gen 2 headers 1 x Clear CMOS header 1 x Chassis Intrusion header 1 x COM Port header 1 x Front Panel Audio header (F_AUDIO) 1 x S/PDIF Out header 1 x SPI TPM header (14-1 pin) 1 x 10-1 pin System Panel header
Camera & audio
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 - 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.
Physical & build
Form Factor
mATX Form Factor 9.6 inch x 9.6 inch (24.4 cm x 24.4 cm)
Operating system & software
Operating System
Windows 11, Windows 10 64-bit
Software Features
ASUS Exclusive Software Armoury Crate - Aura Creator - Aura Sync - Fan Xpert 2+ ASUS AI Advisor ASUS Driver Hub TurboV Core ASUS CPU-Z Norton 360 Deluxe (60 Days Free Trial) WinRAR (40 Days Free Trial) UEFI BIOS ASUS EZ DIY - ASUS CrashFree BIOS 3 - ASUS EZ Flash 3 - ASUS UEFI BIOS EZ Mode - ASUS MyHotkey
Other
Special Features
ASUS 5X PROTECTION III - DIGI+ VRM - LANGuard - Overvoltage protection - SafeSlot - Stainless-steel back I/O ASUS Q-Design - Q-Dashboard - Q-DIMM - Q-LED Core - Q-Slot ASUS Thermal Solution - M.2 heatsink - VRM heatsink design ASUS EZ DIY - BIOS FlashBack button - BIOS FlashBack LED - Pre-mounted I/O shield - SafeSlot Aura Sync - Addressable RGB Gen 2 headers
BIOS
256 Mb Flash ROM, UEFI AMI BIOS
Manageability
WOL by PME, PXE
Accessories
Cables 2 x SATA 6Gb/s cables Miscellaneous 1 x M.2 rubber package 2 x Screw packages for M.2 SSD Documentation 1 x Quick start guide 1 x ACC Express activation key card

I/O Ports 7

  • 2 x USB 10Gbps ports (2 x Type-A)
  • 2 x USB 5Gbps ports (2 x Type-A)
  • 4 x USB 2.0 ports (4 x Type-A)
  • 2 x DisplayPort
  • 1 x HDMI port
  • 1 x Realtek 2.5Gb Ethernet port
  • 3 x Audio jacks

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