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Ryzen 7, Ryzen 9 Processor Supported - 256 GB DDR5 SDRAM Maximum RAM - DIMM, UDIMM - 4 x Memory Slots - Gigabit Ethernet - 2.5Gigabit Ethernet - HDMI - DisplayPort - 4 x SATA Interfaces
$174.31
Special order — estimated available by September 10, 2026.
Genuine ASUS Computer International through authorized distribution — TAA country-of-origin verified and NDAA §889 screened before checkout.
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.
Limited Warranty: 3 Year
About ASUS ASUS is a multinational company best known for their motherboards, PCs, monitors, graphics cards and routers. Along with an expanding range of superior gaming, content-creation and AIoT solutions, ASUS leads the industry through cutting-edge design and innovations made to create the most ubiquitous, intelligent, heartfelt and joyful smart life for everyone. With a global workforce that includes more than 5,000 R&D professionals, ASUS is driven to become the world’s most admired innovative leading technology enterprise. About ROG Republic of Gamers (ROG) is an ASUS sub-brand dedicated to creating the world’s best gaming hardware and software. Formed in 2006, ROG offers a complete line of innovative products known for performance and quality, including motherboards, graphics cards, laptops, desktops, monitors, audio equipment, routers and peripherals. ROG participates in and sponsors major international gaming events. ROG gear has been used to set hundreds of overclocking records and it continues to be the preferred choice of gamers and enthusiasts around the world. © 2024 ASUS Computer International. All Rights Reserved. ASUS is a registered trademark of ASUSTeK Computer. All specifications and terms are subject to change without notice. Please check with your supplier for exact offers on selected models. Products may not be available in all markets. Product may not be exactly as shown in photos. Actual colors may differ from their appearance due to variation of monitor restrictions and color processing. All trademarks are registered to their respective companies. ASUS shall not be liable for technical or editorial errors or omissions contained herein.
| Audio | |
|---|---|
| Audio Channels | 7.1 |
| General Information | |
| Manufacturer | ASUS Computer International |
| Manufacturer Part Number | PRIME B850M-A-CSM |
| 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 |
| I/O Controller | |
| Controller Type | Serial ATA/600 |
| RAID Supported | Yes |
| RAID Levels | 0, 1, 5, 10 |
| I/O Expansions | |
| Total Number of Expansion Slots | 3 |
| Total Number of PCI Express Slots | 3 |
| PCI Express Standard | PCI Express 5.0, PCI Express 4.0 |
| Number of PCI Express x16 Slots | 3 |
| Interfaces/Ports | |
| Total Number of USB Ports | 8 |
| HDMI | Yes |
| DisplayPort | Yes |
| Number of Network (RJ-45) Ports | 1 |
| Memory | |
| Number of Memory Slots | 4 |
| Memory Form Factor | DIMM, UDIMM |
| Maximum Memory Supported | 256 GB |
| Memory Speed Supported | 8000 MHz |
| Memory Technology | DDR5 SDRAM |
| Error Checking | ECC |
| Network & Communication | |
| Gigabit Ethernet | Yes |
| 2.5Gigabit Ethernet | Yes |
| 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" |
| Processor & Chipset | |
| Chipset Manufacturer | AMD |
| Chipset Model | B850 |
| Total Processor Supported | 1 |
| Processor Socket | Socket AM5 |
| Processor Supported | Ryzen 7, Ryzen 9 |
| Technical Information | |
| AI-powered | Yes |
| Video | |
| Onboard Video | CPU Dependent Video |
| Warranty | |
| Limited Warranty | 3 Year |
| Miscellaneous | |
| Package Contents |
|
| Environmental Compliance | Restriction of Hazardous Substances (RoHS) |
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