Asus

Asus Prime B850M-A-CSM Gaming Desktop Motherboard - AMD B850 Chipset - Socket AM5 - Micro ATX (307373)

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SKU:
21547467
MPN:
307373
Availability:
Usually ships the same or next business day. In stock at our CA warehouse.
Shipping:
Calculated at Checkout
Stock Update:
07/30/2026 09:27:51 AM PST
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$189.10

Bulk discount rates

Below are the available bulk discount rates for each individual item when you purchase a certain amount

Buy 2 - 4 and pay only $178.13 each 178.13
Buy 5 or above and pay only $175.32 each 175.32
Stock Update:
07/30/2026 09:27:51 AM PST
Frequently bought together:

Description



This item is brand-new, factory sealed.

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.



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

Features

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

 

Environmental Compliance:   
Restriction of Hazardous Substances (RoHS)

 

Brand Compatibility:   
AMD

 

Specs

Physical Characteristics
Form FactorMicro ATX
Width9.6"
Depth9.6"
Warranty
Limited Warranty3 Year
I/O Expansions
Total Number of Expansion Slots3
PCI Express Standard
Number of PCI Express x16 Slots3
Total Number of PCI Express Slots3
Memory
Memory TechnologyDDR5 SDRAM
Number of Memory Slots4
Memory Speed Supported8000 MHz
Memory Form Factor
Maximum Memory Supported256 GB
Error CheckingECC
General Information
Brand NameAsus
Manufacturer Website Addresshttp://usa.asus.com
Marketing InformationPRIME B850M-A-CSM
ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen

9000 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.
Product TypeGaming Desktop Motherboard
Product NamePRIME B850M-A-CSM Gaming Desktop Motherboard
ManufacturerASUS Computer International
Manufacturer Part NumberPRIME B850M-A-CSM
Product ModelB850M-A-CSM
Product LinePrime
Processor & Chipset
Chipset ManufacturerAMD
Processor Supported
Total Processor Supported1
Processor SocketSocket AM5
Chipset ModelB850
Technical Information
AI-poweredYes
Onboard Interfaces
Number of SATA Interfaces4
Total Number of Onboard USB Ports7
Number of M.2 Interfaces3
Onboard S/PDIF HeaderYes
Number of Onboard USB 2.0 Ports4
Interfaces/Ports
HDMI Version<p>HDMI 2.1</p>
DisplayPortYes
HDMIYes
Total Number of USB Ports8
Number of Network (RJ-45) Ports1
I/O Controller
RAID SupportedYes
Controller TypeSerial ATA/600
RAID Levels
Video
Onboard VideoCPU Dependent Video
Network & Communication
2.5Gigabit EthernetYes
Gigabit EthernetYes
Audio
Audio Channels7.1

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Warranty Information

All Items are Brand New, Factory Sealed and come with a standard warranty. [Read our policies]
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Asus Prime B850M-A-CSM Gaming Desktop Motherboard - AMD B850 Chipset - Socket AM5 - Micro ATX (307373)
$189.10