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ASUS PRIME B850-PLUS-CSM
ASUS · Motherboard

ASUS PRIME B850-PLUS-CSM

B850 · AM5 · ATX · DDR5

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

ASUS PRIME B850-PLUS-CSM is an ATX and B850 chipset motherboard for AM5 processors and DDR5 memory. It came out in 2025.

Released
2025-04-08
Socket
AM5

Specifications

Key specs

Chipset
B850
Form factor
ATX
Memory slots
4
Max memory
256 GB
Socket
AM5
Memory type
DDR5
Released
2025-04-08
Part number
90MB1LC0-M0EAYC
EAN / UPC
4711387982037

Processor

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

Memory

Supported memory types
DDR5-SDRAM
Number of memory slots
4
Memory slots type
DIMM
Memory channels
Dual-channel
ECC сompatibility
ECC & Non-ECC
Maximum internal memory
256 GB
Unbuffered memory
Yes
View all specifications +10 more sectionsShow fewer specifications

Storage controllers

Supported storage drive types
HDD & SSD
Supported storage drive interfaces
M.2, SATA III
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

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
ATX Power connector (24-pin)
Yes
CPU fan connector
Yes
Number of CPU fan connectors
1
Number of chassis fan connectors
4
Chassis intrusion connector
Yes
EPS power connector (8-pin)
Yes
Number of COM connectors
1
Thunderbolt headers
1
12V power connector
Yes
Number of water pump connectors
1
RGB LED pin header
Yes
Number of RGB LED pin headers
3

Rear panel I/O ports

USB 2.0 ports quantity
2
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
3
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity
1
Ethernet LAN (RJ-45) ports
1
HDMI ports quantity
1
DisplayPorts quantity
1
Line-in
Yes
Microphone in
Yes
USB connector type
USB Type-A, USB Type-C

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
Multicolour
Component for
PC
Motherboard form factor
ATX
Motherboard chipset family
AMD
Cooling type
Passive
Windows operating systems supported
Windows 10 x64, Windows 11

Expansion slots

PCI Express x16 (Gen 4.x) slots
1
PCI Express x16 (Gen 5.x) slots
1
Number of M.2 (M) slots
3
1st M.2 largest key size
22110
1st M.2 highest PCI Express generation
5.0

BIOS

BIOS type
UEFI AMI
BIOS memory size
256 Mbit

Weight & dimensions

Width
305 mm
Depth
244 mm
Height
48 mm

Other features

Weight
1.03 kg

Check the manufacturer's page before buying.

Ready to buy? Get the ASUS PRIME B850-PLUS-CSM at today's price.Buy now on Amazon

Compatible processors

AM5 socket

Compatible memory

DDR5

About this product

Prime B850-PLUS-CSM ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B850-PLUS-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.

User manual (PDF)

PRIME B850-PLUS-CSM vs similar motherboards

ASUS PRIME B850-PLUS-CSMASUS PROART B850-CREATOR WIFI NEOASUS B850 MAX GAMING WIFIASUS ROG STRIX B850-A GAMING WIFI7 NEO
ChipsetB850B850B850B850
Form factorATXATXATXATX
Memory slots4444
Max memory256 GB256 GB256 GB256 GB
SocketAM5AM5AM5AM5
Memory typeDDR5DDR5DDR5DDR5
Released2025202620262026

Questions about the PRIME B850-PLUS-CSM

What are the main specs of the ASUS PRIME B850-PLUS-CSM?

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

Which chipset does the ASUS PRIME B850-PLUS-CSM use?

B850.

What form factor is the ASUS PRIME B850-PLUS-CSM?

ATX.

Which socket does the ASUS PRIME B850-PLUS-CSM use?

AM5.

When did the ASUS PRIME B850-PLUS-CSM come out?

It was released in 2025/04 (ASUS).

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