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IN (shopping country)
ASUS PRIME B840M-R
ASUS · Motherboard

ASUS PRIME B840M-R

B840 · AM5 · mATX · DDR5

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  • Chipset B840
  • Form factor mATX
  • Memory slots 2
  • Max memory 128 GB
  • Socket AM5
  • Memory type DDR5

ASUS PRIME B840M-R is a mATX and B840 chipset motherboard for AM5 processors and DDR5 memory. It came out in 2026.

Released
2026-03-21
Socket
AM5

Specifications

Key specs

Chipset
B840
Form factor
mATX
Memory slots
2
Max memory
128 GB
Socket
AM5
Memory type
DDR5
Released
2026-03-21
Part number
90MB1PT0-M0EAY0
EAN / UPC
4711636560702

Processor

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

Memory

Supported memory types
DDR5-SDRAM
Number of memory slots
2
Memory slots type
DIMM
Memory channels
Dual-channel
ECC сompatibility
Non-ECC
Supported memory clock speed (max)
7600 MHz
Maximum internal memory
128 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
6
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
1
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
2
EPS power connector (8-pin)
Yes
Number of COM connectors
1
TPM connector
Yes
12V power connector
Yes

Rear panel I/O ports

USB 2.0 ports quantity
2
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
4
Ethernet LAN (RJ-45) ports
1
PS/2 ports quantity
1
HDMI ports quantity
1
DisplayPorts quantity
1
Headphone outputs
1
Line-in
Yes
Microphone in
Yes
USB connector type
USB Type-A

Network

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

Features

Motherboard chipset
AMD B840
Audio output channels
7.1 channels
Product colour
Multicolour
Component for
PC
Motherboard form factor
micro ATX
Motherboard chipset family
AMD
Windows operating systems supported
Windows 11, Windows 10 x64

Expansion slots

PCI Express x1 (Gen 3.x) slots
1
PCI Express x16 (Gen 4.x) slots
1
Number of M.2 (M) slots
2
1st M.2 largest key size
2280

BIOS

BIOS type
UEFI AMI
BIOS memory size
256 Mbit

Weight & dimensions

Width
236 mm
Depth
229 mm
Height
36.5 mm

Other features

Weight
563 g

Check the manufacturer's page before buying.

Ready to buy? Get the ASUS PRIME B840M-R at today's price.Buy now on Amazon

Compatible processors

AM5 socket

Compatible memory

DDR5

About this product

Prime B840M-R ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B840M-R 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 B840M-R vs similar motherboards

ASUS PRIME B840M-RASUS PRIME B840M-KMSI B840M GAMING WIFI6EGigabyte B840M H Motherboard AMD Ryzen 9000 CPUs, 5+2+2 Phases VRM
ChipsetB840B840B840B840
Form factormATXmATXmATXmATX
Memory slots2222
Max memory128 GB128 GB128 GB128 GB
SocketAM5AM5AM5AM5
Memory typeDDR5DDR5DDR5DDR5
Released2026202620252025

Questions about the PRIME B840M-R

What are the main specs of the ASUS PRIME B840M-R?

B840, AM5, mATX, DDR5, 2 RAM slots.

Which chipset does the ASUS PRIME B840M-R use?

B840.

What form factor is the ASUS PRIME B840M-R?

mATX.

Which socket does the ASUS PRIME B840M-R use?

AM5.

When did the ASUS PRIME B840M-R come out?

It was released in 2026/03 (ASUS).

With photos

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