ASUS Prime B850M-A-CSM

AM5, AMD B850, mATX
3Ratings
BrandMore from ASUS
Delivered between Fri, 5.6. and Tue, 9.6.
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Product details

The ASUS PRIME B850M-A-CSM is a powerful Micro-ATX motherboard designed for the latest AMD AM5 series processors. It supports modern DDR5 memory with speeds of up to 8000 MHz and accommodates up to four RAM modules. With a variety of connectivity options, including PCI-Express 4.0 and 5.0 slots as well as multiple M.2 slots, this motherboard allows for a flexible and high-performance configuration for gaming and productive applications. The integrated video outputs, including HDMI and DisplayPort, along with a comprehensive selection of USB ports, ensure versatile connections to peripherals. Additionally, the motherboard supports RAID configurations and features a 2.5 Gigabit LAN connection, making it an excellent choice for users who prioritize speed and reliability.

  • Support for DDR5 RAM with speeds up to 8000 MHz
  • Variety of expansion slots, including PCI-Express 4.0 and 5.0
  • Three M.2 slots for fast storage
  • Integrated 2.5 Gigabit LAN connection for high network speed
  • Support for RAID configurations (SATA 0, 1, 5, 10).

Key specifications

Mainboard features
Trusted Platform Module
Number of memory modules (RAM)
4x
Memory type
DDR5-RAM
Internal connections
M.2 PCIe (3x), S-ATA III (4x)

General information

Item number
58960852
Manufacturer
ASUS
Category
Motherboards
Manufacturer No.
90MB1LQ0-M0EAYC
Release date
8.4.2025
Sales rank in Category Motherboards
197 of 1069

Motherboard properties

Form factor
Micro ATX (mATX)
Socket
AM5
Chipset
AMD B850
Mainboard features
Trusted Platform Module

Memory

Memory form factor
DIMM
Number of memory modules (RAM)
4x
Max. memory (RAM)
256 GB
Max. RAM OC
8000 MHz
Memory type
DDR5-RAM
RAM buffer
Unbuffered

Graphics properties

Video connections
DisplayPort (2x), HDMI (1x)
Video connection version
Display port 1.4, HDMI 2.1

Network

Network connections
RJ45 2.5 Gigabit Ethernet (1x)
Max. port speed
2.50 Gbit/s

Audio

Audio Connections
Jack 3.5mm Line In (1x), Jack 3.5mm Line Out (1x), Jack 3.5mm Microphone In (1x)

Data storage

RAID configuration
0, 1, 10

Internal interfaces

Internal connections
M.2 PCIe (3x), S-ATA III (4x)
Expansion slot
PCI Express x16 (Gen 4) (1x), PCI Express x16 (Gen 5) (1x)

Further connections

Exact USB ports
USB-A 2.0 (4x), USB-A 3.2 Gen 1 (2x), USB-A 3.2 Gen 2 (2x)

Origin

Country of origin
China

Sustainability

Manufacturer commitment
RE100, SBTi

Voluntary climate contribution

CO₂ emissions
1870.35 kg
Climate contribution
CHF 7.05

Product dimensions

Length
244 mm
Width
244 mm

Package dimensions

Length
27 cm
Width
27 cm
Height
8 cm
Weight
1.39 kg

30-day right of return
36 Months Warranty (Bring-in)
11 additional offers

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Reviews & Ratings

Warranty score

How often does a product of this brand in the «Motherboards» category have a defect within the first 24 months?

Source: Digitec Galaxus
  • 1.MSI
    2.4 %
  • 2.ASUS
    2.5 %
  • 3.Gigabyte
    2.6 %
  • 4.Biostar
    2.8 %
  • 5.AsRock
    2.9 %

Warranty case duration

How many working days on average does it take to process a warranty claim from when it arrives at the service centre until it’s back with the customer?

Source: Digitec Galaxus
  • 1.MSI
    4 days
  • 2.ASUS
    7 days
  • 3.Gigabyte
    8 days
  • 4.AsRock
    9 days
  • 4.NZXT
    9 days

Return rate

How often is a product of this brand in the «Motherboards» category returned?

Source: Digitec Galaxus
  • 1.MSI
    4.8 %
  • 2.ASUS
    5.1 %
  • 2.Gigabyte
    5.1 %
  • 4.AsRock
    5.6 %
  • 5.Biostar
    9.7 %
Source: Digitec Galaxus