Asus
Asus Prime B850M-A-CSM Gaming Desktop Motherboard - AMD B850 Chipset - Socket AM5 - Micro ATX (307373)
- 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
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
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 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.
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
- 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 Factor | Micro ATX |
| Width | 9.6" |
| Depth | 9.6" |
| Warranty | |
| Limited Warranty | 3 Year |
| I/O Expansions | |
| Total Number of Expansion Slots | 3 |
| PCI Express Standard |
|
| Number of PCI Express x16 Slots | 3 |
| Total Number of PCI Express Slots | 3 |
| Memory | |
| Memory Technology | DDR5 SDRAM |
| Number of Memory Slots | 4 |
| Memory Speed Supported | 8000 MHz |
| Memory Form Factor |
|
| Maximum Memory Supported | 256 GB |
| Error Checking | ECC |
| General Information | |
| Brand Name | Asus |
| Manufacturer Website Address | http://usa.asus.com |
| Marketing Information | PRIME 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 Type | Gaming Desktop Motherboard |
| Product Name | PRIME B850M-A-CSM Gaming Desktop Motherboard |
| Manufacturer | ASUS Computer International |
| Manufacturer Part Number | PRIME B850M-A-CSM |
| Product Model | B850M-A-CSM |
| Product Line | Prime |
| Processor & Chipset | |
| Chipset Manufacturer | AMD |
| Processor Supported |
|
| Total Processor Supported | 1 |
| Processor Socket | Socket AM5 |
| Chipset Model | B850 |
| Technical Information | |
| AI-powered | Yes |
| Onboard Interfaces | |
| Number of SATA Interfaces | 4 |
| Total Number of Onboard USB Ports | 7 |
| Number of M.2 Interfaces | 3 |
| Onboard S/PDIF Header | Yes |
| Number of Onboard USB 2.0 Ports | 4 |
| Interfaces/Ports | |
| HDMI Version | <p>HDMI 2.1</p> |
| DisplayPort | Yes |
| HDMI | Yes |
| Total Number of USB Ports | 8 |
| Number of Network (RJ-45) Ports | 1 |
| I/O Controller | |
| RAID Supported | Yes |
| Controller Type | Serial ATA/600 |
| RAID Levels |
|
| Video | |
| Onboard Video | CPU Dependent Video |
| Network & Communication | |
| 2.5Gigabit Ethernet | Yes |
| Gigabit Ethernet | Yes |
| Audio | |
| Audio Channels | 7.1 |
Warranty Information