ASUS PRIME B850M-A-CSM AM5 Micro ATX Motherboard
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ASUS
90MB1LQ0-M0EAYC
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ASUS PRIME B850M-A-CSM AM5 Micro ATX Motherboard
A compact business-ready AM5 motherboard with DDR5, PCIe 5.0, three M.2 slots, 2.5GbE LAN, USB-C 20Gbps and ASUS CSM support.
AMD AM5B850 ChipsetDDR52.5GbE LAN
The ASUS PRIME B850M-A-CSM is a Micro ATX motherboard for AMD Socket AM5 Ryzen 9000, 8000 and 7000 Series desktop processors. It is a practical choice for compact business, office and productivity PCs where DDR5 memory, PCIe 5.0 support, three M.2 slots, Realtek 2.5Gb Ethernet, USB-C connectivity and ASUS CSM deployment support are important.
Compatibility Note: Please confirm CPU support, BIOS version, DDR5 memory QVL, case size and cooler clearance before purchase. PCIe 5.0 and M.2 behavior can vary depending on the installed Ryzen processor.
Best For
✓ Compact AM5 business PCs
✓ Office and productivity builds
✓ DDR5 and triple M.2 storage
✓ Wired 2.5GbE network setups
Key Features
Compact AM5 Business Platform
The Micro ATX format and AM5 socket make this board suitable for compact Ryzen office, business and productivity desktops.
DDR5 and PCIe 5.0 Ready
Four DDR5 DIMM slots, PCIe 5.0 support and three M.2 slots provide a strong platform for responsive AM5 desktop systems.
Business-Friendly Connectivity
Realtek 2.5Gb Ethernet, HDMI, DisplayPort, rear USB 20Gbps Type-C and front USB 10Gbps Type-C support fit modern office desktops.
ASUS CSM Focus
The CSM version is suited to business deployments where practical stability, manageability and longer availability planning matter.
Technical Specifications
Frequently Asked Questions
Singular Expert Insight
Choose this model if you need a compact AM5 CSM motherboard with DDR5, strong B850 platform features, 2.5GbE LAN, three M.2 slots and USB-C 20Gbps. If wireless networking is required, choose the Wi-Fi version instead.
Buyer’s Guide
Buy it if
You are building a compact Ryzen AM5 business PC and want DDR5, PCIe 5.0, triple M.2 storage, 2.5GbE LAN and CSM support.
Skip it if
You need built-in Wi-Fi, Wi-Fi 7, rear USB4 connectivity, a full ATX layout or a gaming-branded motherboard.
Also consider
Consider ASUS PRIME B850M-A WIFI if wireless networking is required, or an ASUS TUF B850M board for a more gaming-focused compact build.
Features - ASUS - 90MB1LQ0-M0EAYC
CPU Socket
- Socket AM5
More Details
Product Code
04:533637
EAN Code
4711636054720
Manufacturer
ASUS