PC-Build.online

Builds

PC build by budgetBudget build guides

Builder

Laptops

PC Components

Parts

ProcessorsMotherboardsCPU CoolersRAMGraphics CardsCabinetsCase FansSound CardsM.2 SSD HeatsinksGPU Brackets & Riser CablesCMOS BatteriesThermal PasteRGB, Fan Controllers & LED StripsAll components

Compare

GPU vs GPUCPU vs CPUGPU rankingCPU ranking

Tools

Compatibility checkerPSU wattage calculatorFPS calculatorBottleneck calculatorRAM calculatorUPS calculatorCan I run it?Upgrade advisorBudget splitterAll calculators

Games

Guides

BlogHow to build a PCChoosing a CPUChoosing a GPUHow much RAM?Can I run it?FPS calculatorAll guides
IN (shopping country)
ASUS PRIME B840M-A
ASUS · Motherboard

ASUS PRIME B840M-A

B840 · AM5 · mATX · DDR5

See today's price, delivery and offers at the store.

Buy now on AmazonAdd to your build
  • Chipset B840
  • Form factor mATX
  • Memory slots 4
  • Max memory 256 GB
  • Socket AM5
  • Memory type DDR5

ASUS PRIME B840M-A is a mATX and B840 chipset motherboard for AM5 processors and DDR5 memory. It came out in 2025.

Released
2025-05-10
Socket
AM5

Specifications

Key specs

Chipset
B840
Form factor
mATX
Memory slots
4
Max memory
256 GB
Socket
AM5
Memory type
DDR5
Released
2025-05-10
Part number
PRIME B840M-A

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
Maximum internal memory
256 GB
Unbuffered memory
Yes
View all specifications +9 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
Front panel connector
Yes
ATX Power connector (24-pin)
Yes
CPU fan connector
Yes
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
4
USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity
1
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity
2
Ethernet LAN (RJ-45) ports
1
HDMI ports quantity
1
DisplayPorts quantity
2

Network

Ethernet LAN
Yes
Ethernet interface type
2.5 Gigabit Ethernet

Features

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

Expansion slots

PCI Express x16 (Gen 3.x) slots
2
PCI Express x16 (Gen 4.x) slots
1
Number of M.2 (M) slots
3
1st M.2 largest key size
2280
1st M.2 highest PCI Express generation
4.0
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
3.0

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.

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

Compatible processors

AM5 socket

Compatible memory

DDR5

About this product

B840M-A

ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B840M-A 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. Performance AI Solutions ASUS AI Solutions include AI Advisor as your technical expert with expertise in PC performance. ASUS AI Advisor allows users to explore the functionality and advanced features of ASUS motherboards in a simple and straightforward way.

User manual (PDF)

PRIME B840M-A vs similar motherboards

ASUS PRIME B840M-AGigabyte B840M D3HP Motherboard AMD Ryzen 9000 CPUs, 8+2+2 Phases VRMGigabyte B840M D3HP WIFI6E Motherboard AMD Ryzen 9000 CPUsGigabyte B840M GAMING PLUS WIFI6E Motherboard AMD Ryzen 9000 CPUs
ChipsetB840B840B840B840
Form factormATXmATXmATXmATX
Memory slots4444
Max memory256 GB256 GB256 GB256 GB
SocketAM5AM5AM5AM5
Memory typeDDR5DDR5DDR5DDR5
Released2025202620252025

Questions about the PRIME B840M-A

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

B840, AM5, mATX, DDR5, 4 RAM slots.

Which chipset does the ASUS PRIME B840M-A use?

B840.

What form factor is the ASUS PRIME B840M-A?

mATX.

Which socket does the ASUS PRIME B840M-A use?

AM5.

When did the ASUS PRIME B840M-A come out?

It was released in 2025/05 (ASUS).

With photos

Popular motherboards

All motherboards →

Similar motherboards

ASUS PRIME B840M-ABuy now on Amazon