What type of memory does this motherboard support?

This motherboard supports DDR5 memory.

Is Wi-Fi connectivity included, or will I need to purchase an additional Wi-Fi card?

Yes, Wi-Fi connectivity is included.

How many M.2 slots are available on this motherboard?

This motherboard has three M.2 slots.

Can this motherboard support the latest AMD Ryzen 9000 series processors?

Yes, this motherboard supports the latest AMD Ryzen 9000 series processors.

Are there any built-in cooling solutions on this motherboard?

Yes, this motherboard features VRM and M.2 heatsinks as part of its comprehensive cooling solutions.

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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

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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

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

Overview

Specs

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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	October 30, 2025

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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

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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

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