The ASUS PRIME B850-PLUS-CSM (90MB1LC0-M0EAYC) is an AMD B850 ATX motherboard for AM5 Ryzen 9000, 8000 and 7000 processors, built for business and professional PCs. It supports up to 256GB of DDR5 memory at up to 8000+ MT/s (OC), a PCIe 5.0 x16 graphics slot, a PCIe 5.0 M.2 slot among three M.2 slots, and Realtek 2.5Gb Ethernet.
As part of the ASUS Corporate Stable Model (CSM) program, it is designed for stable, long-term deployment with up to 36-month product lifecycle support (varies by region) and includes ASUS Control Center Express (ACC Express) for remote IT monitoring and management. ASUS 5X Protection III, a flexible M.2 heatsink, BIOS FlashBack and Q-Design features make building and servicing easy.
Key Features
AMD B850 chipset, AM5 socket for Ryzen 9000 / 8000 / 7000 (up to 170W CPUs)
4x DDR5 DIMM, up to 256GB, up to 8000+ MT/s (OC), AMD EXPO and ASUS AEMP
PCIe 5.0 x16 slot (with Ryzen 9000/7000) with SafeSlot
3x M.2 slots including one PCIe 5.0 x4, plus 4x SATA 6Gb/s
Realtek 2.5Gb Ethernet with ASUS LANGuard
Rear USB 10Gbps Type-C and 3x USB 10Gbps Type-A, front USB 5Gbps Type-C header
DisplayPort and HDMI outputs for processors with integrated graphics
Corporate Stable Model with ASUS Control Center Express (ACC Express) included
BIOS FlashBack button, pre-mounted I/O shield and Q-Design features
Full Specifications
General
Brand
ASUS
Model
PRIME B850-PLUS-CSM
Part Number
90MB1LC0-M0EAYC
Chipset
AMD B850
Socket
AMD AM5
CPU Support
AMD Ryzen 9000 / 8000 / 7000 Series, up to 170W
Form Factor
ATX, 30.5 x 24.4 cm
Memory
Slots
4 x DIMM, dual channel
Max Capacity
256GB DDR5
Speed
Up to 8000+ MT/s (OC)
Type
ECC & non-ECC unbuffered DDR5; AMD EXPO, ASUS AEMP
1 x USB 10Gbps Type-C, 3 x USB 10Gbps Type-A, 2 x USB 5Gbps Type-A, 2 x USB 2.0
Front USB
1 x USB 5Gbps Type-C connector, 1 x USB 5Gbps header (2 ports), 2 x USB 2.0 headers (4 ports)
Video Outputs
1 x DisplayPort, 1 x HDMI
Audio
Realtek 7.1 HD audio codec
Other
BIOS FlashBack button, 3x ARGB Gen 2 headers, COM header, SPI TPM header, Thunderbolt (USB4) header
Business Features
Program
ASUS Corporate Stable Model (CSM)
Lifecycle
Up to 36-month lifecycle support (varies by region)
Management
ASUS Control Center Express (ACC Express), Wake-on-LAN, PXE
OS
Windows 11, Windows 10 64-bit
Warranty
Warranty
Official ASUS warranty
Who Is This For?
Businesses and IT departments deploying stable AM5 desktops
Office and professional workstations that need remote management
System builders wanting a reliable B850 board with PCIe 5.0
Users who prefer wired 2.5GbE networking without Wi-Fi
In the Box
PRIME B850-PLUS-CSM motherboard
2 x SATA 6Gb/s cables
1 x M.2 rubber pad package
3 x M.2 screw packages
1 x ACC Express activation key card
1 x Quick start guide
Why Buy from PC PARK?
100% original product with official warranty
Delivery to all regions of Saudi Arabia (Riyadh, Jeddah, Dammam and more)
Secure online checkout
Pre- and after-sales support from the PC PARK team
Frequently Asked Questions
Which processors does it support? AMD Ryzen 9000, 8000 and 7000 series desktop processors on socket AM5.
Does it have Wi-Fi? No, this model has Realtek 2.5Gb wired Ethernet and no built-in Wi-Fi.
What does CSM mean? CSM (Corporate Stable Model) is an ASUS program for business users offering stable supply, lifecycle support and ASUS Control Center Express.
How much memory does it support? Up to 256GB of DDR5 across 4 DIMM slots, at up to 8000+ MT/s (OC).
Is the product original? Yes, PC PARK sells 100% original ASUS products.
Does it come with a warranty? Yes, it comes with the official ASUS warranty.
Do you deliver across Saudi Arabia? Yes, PC PARK delivers to all regions of Saudi Arabia including Riyadh, Jeddah and Dammam.
Order the ASUS PRIME B850-PLUS-CSM motherboard from PC PARK with official warranty and fast delivery across Saudi Arabia.
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Our Milestones
2023
Expanded our product catalog with the latest gaming and professional hardware, serving thousands of satisfied customers
2024
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2025
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2026
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