ASUS 

ASUS MB PRIME B850M-A-CSM B850 AM5 max.256GB DDR5 mATX Retail

Mfg Part Number:  PRIME B850M-A-CSM  
Image may not reflect the actual item.
Price: $232.62
Quantity:
In Stock: 28
Last Updated: Jun 17, 2026
No Sales Tax except these states
, PO and Wire.

PRIME B850M-A-CSM

ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen9000 series processors. The PRIME B850M-A-CSM motherboard provides users and PC DIY builders with a range of performance optimizations via intuitive software and firmware features. It's designed to be Advanced AI PC-ready, offering the power and connectivity needed for demanding AI applications.

ASUS Corporate Stable Model

ASUS Corporate Stable Model (CSM) is a commercial program designed to provide stable and reliable motherboards. Offering up to 36-month product lifecycle support and 6-month end-of-life notice to allow sufficient lead times for your organization to get ready for product transitions. Each purchase of an ASUS CSM motherboard comes with ASUS Control Center Express - server-grade IT management software.

ASUS Control Center Express

ASUS Control Center Express is an integrated IT monitoring and management software designed to deploy faster, simplify IT operations and improve productivity with comprehensive control and user-friendly functions. ASUS Control Center Express is compatible with over 100 ASUS motherboards to provide a high-quality, TCO-optimized solution for your business needs.

Optimize IT endpoint management

Designed to assist IT staff in monitoring and controlling devices within their corporate networks, and facilitate inventory checking in multiple locations remotely.

Automate IT maintenance

Allows IT staff to schedule automatic updates of the latest BIOS, software and utilities to specific or all devices at off-peak times, enhancing system stability and IT operational flexibility.

Securely manage all of endpoints

Securely manage endpoint configuration, portable storage access and PC software applications by enabling them to create grouping rules on individual devices.

Performance | AI Solutions

ASUS AI Solutions include AI Cache Boost to supercharge large language model (LLM) workflows, ASUS AI Advisor as your technical expert with expertise in PC performance.

AI Cache Boost

Supercharge your large language model (LLM) workflows with AI Cache Boost. Exclusive to ASUS AMD 800 and 600 series motherboards that use Ryzen™ 9000 Series CPUs, this BIOS setting optimizes CPU cache and memory pathways to deliver up to 29% faster local LLM performance with high-speed memory tuning.

AI Advisor

ASUS AI Advisor allows users to explore the functionality and advanced features of ASUS motherboards in a simple and straightforward way.

Performance | Digital Power Design

PRIME B850M-A-CSM features an 8+2+1 phase power design with discrete MOSFETs, ensuring efficient and stable power delivery for AMD processors plus steady performance for day-to-day use.

Six-layer PCB design

Enhanced stability and overclocking.

The multi-layered printed circuit board design quickly dissipates heat around the voltage regulators to improve overall system stability and provide the CPU with more overclocking headroom.

Digi+ VRM control

Real-time voltage control.

The Digi+ voltage-regulator module (VRM) delivers real-time control over voltage droop, automatically switching frequency and power-efficiency settings.

Main Specification
General Information
Manufacturer ASUS Computer International
Manufacturer Part Number PRIME B850M-A-CSM
Manufacturer Website Address http://usa.asus.com
Brand Name Asus
Product Line Prime
Product Model B850M-A-CSM
Product Name PRIME B850M-A-CSM Gaming Desktop Motherboard
Product Type Gaming Desktop Motherboard
Technical Information
AI-powered Yes
Processor & Chipset
Chipset Manufacturer AMD
Chipset Model B850
Total Processor Supported 1
Processor Socket Socket AM5
Processor Supported Ryzen 7
Processor Supported Ryzen 9
Memory
Number of Memory Slots 4
Memory Form Factor UDIMM
Memory Form Factor DIMM
Maximum Memory Supported 256 GB
Memory Technology DDR5 SDRAM
Memory Speed Supported 8000 MHz
Error Checking ECC
I/O Controller
Controller Type Serial ATA/600
RAID Supported Yes
RAID Levels 10
RAID Levels 1
RAID Levels 5
RAID Levels 0
Video
Onboard Video CPU Dependent Video
Audio
Audio Channels 7.1
Network & Communication
Gigabit Ethernet Yes
2.5Gigabit Ethernet Yes
I/O Expansions
Total Number of Expansion Slots 3
PCI Express Standard PCI Express 4.0
PCI Express Standard PCI Express 5.0
Total Number of PCI Express Slots 3
Number of PCI Express x16 Slots 3
Interfaces/Ports
Total Number of USB Ports 8
HDMI Yes
HDMI Version

HDMI 2.1

DisplayPort Yes
Number of Network (RJ-45) Ports 1
Onboard Interfaces
Number of SATA Interfaces 4
Number of M.2 Interfaces 3
Total Number of Onboard USB Ports 7
Number of Onboard USB 2.0 Ports 4
Onboard S/PDIF Header Yes
Physical Characteristics
Form Factor Micro ATX
Width 9.6"
Depth 9.6"
Miscellaneous
Package Contents
  • PRIME B850M-A-CSM Gaming Desktop Motherboard
  • 2 x SATA 6Gb/s Cables
  • 1 x M.2 Rubber Package
  • 2 x Screw Packages for M.2 SSD
  • 1 x Quick Start Guide
  • 1 x ACC Express Activation Key Card
Brand Compatibility AMD
Environmental Compliance Restriction of Hazardous Substances (RoHS)
Warranty
Limited Warranty 3 Year
WARNING:: The plastic used in cable products can expose you to lead and lead components, chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov
[0] [true] [Yes] [No] [Yes]