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Main image of ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Alt view image 2 of 10 - ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Alt view image 3 of 10 - ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Alt view image 4 of 10 - ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Alt view image 5 of 10 - ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Alt view image 6 of 10 - ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Alt view image 7 of 10 - ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Alt view image 8 of 10 - ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Alt view image 9 of 10 - ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Alt view image 10 of 10 - ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

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ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Item #: 9B-13-119-761
Mfr. Part #: 90MB1LN0-MVAAYC
UNSPSC: 43201513

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Ready for Advanced AI PC: Designed for the future of AI computing, with the power and connectivity needed for demanding AI applications
AMD AM5 Socket: Ready for AMD Socket AM5 for AMD Ryzen 9000 & 8000 & 7000 Series Desktop Processors
ASUS CSM Program: A stable motherboard supply, end-of-life notifications, and IT software for business motherboards
ASUS Control Center Express: Integrated IT monitoring and management software that simplifies enterprise-level system administration
Enhanced Power Solution: 6-layer PCB, alloy chokes and durable capacitors for stable power delivery
Ultrafast Connectivity: Wi-Fi 6E, PCIe 5.0 x16 slot, PCIe 5.0 M.2 slot, Realtek 2.5Gb Ethernet, rear USB 10Gbps Type-A ports, front USB 5Gbps Type-C support
Comprehensive Cooling: VRM and M.2 heatsinks, PCH heatsink, hybrid fan headers and Fan Xpert 2+
DIY Friendly Design: Pre-mounted I/O shield, BIOS FlashBack, M.2 heatsink, Q-Antenna, Q-Dashboard, Q-LED Core

Overview

Specs

Reviews

ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M. 2, Wi-Fi 6E, 2.5G b LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Model
Brand	ASUS
Model	PRIME B850M-A WIFI-CSM

Supported CPU
CPU Socket Type	AM5
CPU Type	Ryzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series

Chipsets
Chipset	AMD B850

Memory
Number of Memory Slots	4x288pin (DDR5)
Memory Standard	Supports up to 8000+MT/s (OC)
Maximum Memory Supported	256GB
Channel Supported	Dual Channel
ECC Supported	Yes
Buffer Supported	Un-buffered
Memory Feature	ASUS Enhanced Memory Profile (AEMP)

Expansion Slots
PCI Express 5.0 x16	AMD Ryzen 9000 & 7000 Series Desktop Processors 1 x PCIe 5.0 x16 slot (supports x16 mode) AMD Ryzen 8000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)
PCI Express 4.0 x16	AMD B850 Chipset 1 x PCIe 4.0 x16 slot (supports x1 mode)

Storage Devices
Serial ATA (SATA)	4 x SATA 6Gb/s
M.2	AMD Ryzen 9000 & 7000 Series Desktop Processors M.2_1 slot (Key M), type 2280 (supports PCIe 5.0 x4 mode) M.2_2 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) AMD Ryzen 8000 Series Desktop Processors M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) M.2_2 slot (Key M), type 2280 (supports PCIe 4.0 x4/x2 mode)* AMD B850 Chipset M.2_3 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
SATA RAID	AMD RAIDXpert2 Technology Ryzen 9000 Series Processors: RAID 0/1/5/10 Ryzen 8000 Series Processors: RAID 0/1 Ryzen 7000 Series Processors: RAID 0/1/10

Onboard Audio
Audio Channels	Realtek 7.1 Surround Sound High Definition Audio CODEC* - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking - Supports up to 24-Bit/192 kHz playback Audio Features - Audio Shielding - Premium audio capacitors - Dedicated audio PCB layers * A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.

Onboard LAN
Max LAN Speed	2.5Gbps
Wireless LAN	Wi-Fi 802.11 ax
Bluetooth	Bluetooth 5.4

Rear Panel Ports
Back I/O Ports	2 x USB 10Gbps ports (2 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) 2 x DisplayPort 1 x HDMI port 1 x Wi-Fi module 1 x Realtek 2.5Gb Ethernet port 3 x Audio jacks 1 x BIOS FlashBack button

Internal I/O Connectors
Onboard USB	1 x USB 5Gbps connector (supports USB Type-C) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports
Other Connectors	Fan and Cooling Related 1 x 4-pin CPU Fan header 1 x 4-pin CPU OPT Fan header 1 x 4-pin AIO Pump header 3 x 4-pin Chassis Fan headers Miscellaneous 3 x Addressable RGB Gen 2 headers 1 x Clear CMOS header 1 x Chassis Intrusion header 1 x COM Port header 1 x Front Panel Audio header (F_AUDIO) 1 x S/PDIF Out header 1 x SPI TPM header (14-1 pin) 1 x 10-1 pin System Panel header

Physical Spec
Form Factor	Micro ATX
Dimensions (W x L)	9.6" x 9.6"
Power Pin	1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector 1 x 4-pin +12V CPU Power connector

Software Feature
BIOS Feature	256 Mb Flash ROM, UEFI AMI BIOS
Software	ASUS Exclusive Software Armoury Crate - Aura Creator - Aura Sync - Fan Xpert 2+ - Power Saving ASUS AI Advisor ASUS Driver Hub ASUS GlideX TurboV Core ASUS CPU-Z Adobe Creative Cloud (Free Trial) Norton 360 Deluxe (60 Days Free Trial) WinRAR (40 Days Free Trial) UEFI BIOS ASUS EZ DIY - ASUS CrashFree BIOS 3 - ASUS EZ Flash 3 - ASUS UEFI BIOS EZ Mode - ASUS MyHotkey
Windows 11	Supported

Features
Features	ASUS 5X PROTECTION III - DIGI+ VRM - LANGuard - Overvoltage protection - SafeSlot - Stainless-steel back I/O ASUS Q-Design - Q-Antenna - Q-Dashboard - Q-DIMM - Q-LED Core - Q-Slot ASUS Thermal Solution - M.2 heatsink - VRM heatsink design ASUS EZ DIY - BIOS FlashBack button - BIOS FlashBack LED - Pre-mounted I/O shield - SafeSlot Aura Sync - Addressable RGB Gen 2 headers

Packaging
Package Contents	Cables 2 x SATA 6Gb/s cables Miscellaneous 1 x ASUS WiFi Q-Antenna 1 x M.2 rubber package 1 x Screw package for M.2 SSD Documentation 1 x Quick start guide

Additional Information
First Listed on Newegg	August 13, 2025

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 3 years
Limited Warranty period (labor): 3 years

Return Policies

Return for refund within: 30 days
Return for replacement within: 30 days
Restocking Fee: Yes
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ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Learn more about the ASUS PRIME B850M-A WIFI-CSM

Customer Reviews of the ASUS PRIME B850M-A WIFI-CSM

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: 9B-13-119-761

Best Sellers

ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 mATX motherboard, DDR5, PCIe 5.0 Ready, 3x M.2, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB Type-C, ASUS Control Center Express Remote IT Management

Learn more about the ASUS PRIME B850M-A WIFI-CSM

Customer Reviews of the ASUS PRIME B850M-A WIFI-CSM

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info