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ASUS PRIME B850M-A-CSM
ASUS · Motherboard

ASUS PRIME B850M-A-CSM

B850 · AM5 · mATX · DDR5

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  • Chipset B850
  • Form factor mATX
  • Memory slots 4
  • Max memory 256 GB
  • Socket AM5
  • Memory type DDR5

ASUS PRIME B850M-A-CSM is a mATX and B850 chipset motherboard for AM5 processors and DDR5 memory. It came out in 2025.

Released
2025-04-11
Socket
AM5

Specifications

Key specs

Chipset
B850
Form factor
mATX
Memory slots
4
Max memory
256 GB
Socket
AM5
Memory type
DDR5
Released
2025-04-11
Part number
90MB1LQ0-M0EAYC
EAN / UPC
4711636054706

Processor

Processor manufacturer
AMD
Processor socket
Socket AM5
Compatible processor series
AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
Supported processor sockets
Socket AM5

Memory

Supported memory types
DDR5-SDRAM
Number of memory slots
4
Memory slots type
DIMM
Memory channels
Dual-channel
ECC сompatibility
ECC & Non-ECC
Supported memory clock speed (max)
8000 MHz
Maximum internal memory
256 GB
Unbuffered memory
Yes
Maximum internal memory per slot
64 GB
View all specifications +9 more sectionsShow fewer specifications

Storage controllers

Supported storage drive types
HDD & SSD
Supported storage drive interfaces
PCI Express 4.0, PCI Express 5.0
Number of HDDs supported
4
Number of storage drives supported
7
RAID support
Yes
RAID levels
0, 1, 5, 10

Graphics

Parallel processing technology support
Not supported
Maximum resolution
7680 x 4320 pixels

Internal I/O

USB 2.0 connectors
2
USB 3.2 Gen 1 (3.1 Gen 1) connectors
2
Number of SATA III connectors
4
S/PDIF out connector
Yes
Front panel audio connector
Yes
Front panel connector
Yes
ATX Power connector (24-pin)
Yes
CPU fan connector
Yes
Number of CPU fan connectors
1
Number of chassis fan connectors
3
Chassis intrusion connector
Yes
Peripheral (Molex) power connectors (4-pin)
1
EPS power connector (8-pin)
Yes
Number of EPS power connectors (8-pin)
1
Number of COM connectors
1
TPM connector
Yes
12V power connector
Yes
RGB LED pin header
Yes
Number of RGB LED pin headers
3

Rear panel I/O ports

USB 2.0 ports quantity
4
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
2
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity
2
Ethernet LAN (RJ-45) ports
1
HDMI ports quantity
1
HDMI version
2.1
DisplayPorts quantity
2
DisplayPort version
1.4
Headphone outputs
1
Line-in
Yes
Microphone in
Yes

Network

Ethernet LAN
Yes
Ethernet interface type
2.5 Gigabit Ethernet
Top Wi-Fi standard
Not available

Features

Motherboard chipset
AMD B850
Audio output channels
7.1 channels
Product colour
Grey
Component for
PC
Motherboard form factor
micro ATX
Motherboard chipset family
AMD
Cooling type
Passive
Power source type
ATX
Windows operating systems supported
Windows 10 x64, Windows 11

Expansion slots

PCI Express x16 (Gen 4.x) slots
2
PCI Express x16 (Gen 5.x) slots
1
Number of M.2 (M) slots
3
1st M.2 largest key size
2280
1st M.2 highest PCI Express generation
5.0
2nd M.2 largest key size
2280
2nd M.2 highest PCI Express generation
4.0
3rd M.2 largest key size
2280
3rd M.2 highest PCI Express generation
4.0
4th M.2 largest key size
2280
4th M.2 highest PCI Express generation
4.0

BIOS

BIOS type
UEFI AMI
BIOS memory size
256 Mbit

Weight & dimensions

Width
244 mm
Depth
244 mm

Check the manufacturer's page before buying.

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Compatible processors

AM5 socket

Compatible memory

DDR5

About this product

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.

User manual (PDF)

PRIME B850M-A-CSM vs similar motherboards

ASUS PRIME B850M-A-CSMASUS PRO WS B850M-ACE SEASUS TUF GAMING B850M-PLUS IIASUS TUF GAMING B850M-PLUS WIFI7
ChipsetB850B850B850B850
Form factormATXmATXmATXmATX
Memory slots4444
Max memory256 GB256 GB256 GB256 GB
SocketAM5AM5AM5AM5
Memory typeDDR5DDR5DDR5DDR5
Released2025202520252025

Questions about the PRIME B850M-A-CSM

What are the main specs of the ASUS PRIME B850M-A-CSM?

B850, AM5, mATX, DDR5, 4 RAM slots.

Which chipset does the ASUS PRIME B850M-A-CSM use?

B850.

What form factor is the ASUS PRIME B850M-A-CSM?

mATX.

Which socket does the ASUS PRIME B850M-A-CSM use?

AM5.

When did the ASUS PRIME B850M-A-CSM come out?

It was released in 2025/04 (ASUS).

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