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ASUS PRIME B840M-R AMD B840 AM5 DDR5 micro-ATX Motherboard

Brand:
ASUS
ASUS PRIME B840M-R AM5 Motherboard
ASUS PRIME B840M-R AMD B840 AM5 DDR5 micro-ATX Motherboard
€138.59 inc. VAT
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90MB1PT0-M0EAY0
€116.46 €129.40
€138.59 inc. VAT
Ships from EU stock: 9 item(s)
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Product Code
04:590448
EAN Code
4711636560696
Manufacturer
ASUS

Quick Specs

Platform
AMD B840 / Socket AM5
CPU support
Ryzen 9000 / 8000 / 7000, up to 120W
Memory
2 × DDR5 DIMM, up to 128GB
Storage
2 × M.2 / 4 × SATA 6Gb/s
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A compact foundation for an AM5 desktop

AM5 up to 120WDual DDR5Two M.2 slotsGigabit Ethernet

The ASUS PRIME B840M-R is a micro-ATX motherboard for building a desktop around a supported AMD Ryzen processor. It connects the CPU, DDR5 memory, storage, expansion cards and case wiring; it is not a complete computer. Supply a supported AM5 processor up to 120W, cooler, DDR5 memory, storage, power supply and compatible case separately.

Before you order:
Check the ASUS CPU support list, required BIOS and memory QVL before assembly. DisplayPort and HDMI work only with a CPU featuring integrated graphics. Ryzen 8000 processors change the main PCIe slot to x8 or x4 according to the CPU.

What's in the Box

  • PRIME B840M-R motherboard
  • 2 × SATA 6Gb/s cables
  • 1 × I/O shield
  • 1 × M.2 SSD screw package
  • 1 × quick start guide

What It Means in Practice

  • Fit the board to a compatible micro-ATX case, install the CPU/cooler and DDR5 memory, connect storage and PSU cables, then install your operating system.
  • Use the CPU-connected PCIe 4.0 M.2 slot for a compatible main SSD and the chipset PCIe 3.0 M.2 slot for additional storage.
  • Front USB ports require corresponding case connections; internal headers are not additional exposed rear sockets.

What Will Not Work

  • DDR4 memory and processors using other sockets are not supported.
  • Do not select a CPU above the manufacturer’s 120W support limit.
  • Motherboard video outputs cannot provide a picture from a CPU without integrated graphics.
  • Wi-Fi or Bluetooth is not listed as built-in; add a suitable adapter if required.

Key Features

 
DDR5 with processor-dependent tuning
Two DIMM slots support up to 128GB. EXPO and AEMP profiles simplify supported memory settings, while actual speeds depend on CPU, memory kit and BIOS configuration.
 
Storage choice for a compact build
Two M.2 slots offer PCIe 4.0 x4 and PCIe 3.0 x4 connections, alongside four SATA ports. Check each slot’s supported drive length and interface before purchase.
 
Useful connections and build aids
Gigabit Ethernet, HDMI, DisplayPort and rear USB cover common desk connections. Q-LED diagnostics, Q-DIMM and Q-Slot assist installation and troubleshooting.

Technical Specifications

Platform & memory
Model / MPN PRIME B840M-R / 90MB1PT0-M0EAY0
EAN 4711636560696
Chipset / socket AMD B840 / AM5
CPU support AMD Ryzen 9000 / 8000 / 7000; up to 120W CPUs, subject to support list and BIOS
Memory slots / maximum 2 × DDR5 DIMM / 128GB
Memory architecture Dual-channel, non-ECC unbuffered; on-die ECC supported
Memory OC rates Ryzen 9000/7000: up to 7200+MT/s; Ryzen 8000: up to 7600+MT/s
Memory profiles AMD EXPO / ASUS AEMP; CPU and kit dependent
Expansion & storage
Main expansion slot 1 × PCIe 4.0 x16; x16 with Ryzen 9000/7000, x8/x4 with Ryzen 8000 depending on CPU
Additional expansion 1 × PCIe 3.0 x1
M.2_1 Key M, 2280, PCIe 4.0 x4
M.2_2 Key M, 2242/2260/2280, PCIe 3.0 x4
SATA 4 × SATA 6Gb/s
RAID AMD RAIDXpert2, RAID 0/1/5/10
Graphics, network & audio
DisplayPort 1 × DisplayPort 1.4, up to 8K at 30Hz; requires CPU integrated graphics
HDMI 1 × HDMI 2.1, up to 4K at 60Hz; requires CPU integrated graphics
Ethernet Realtek 1Gb Ethernet / ASUS LANGuard
Audio Realtek 7.1 HD Audio, up to 24-bit/192kHz playback
Audio limitation 7.1 output requires chassis front HD Audio module
Rear I/O
Rear USB 4 × USB 5Gbps Type-A / 2 × USB 2.0 Type-A
Rear display / LAN / audio 1 × DisplayPort / 1 × HDMI / 1 × RJ45 / 3 × audio jacks
Legacy input 1 × PS/2 keyboard/mouse combo
Internal headers
Cooling headers 1 × 4-pin CPU fan / 2 × 4-pin chassis fan
Power connectors 1 × 24-pin main / 1 × 8-pin CPU +12V
Front USB-C 1 × USB 5Gbps connector, Type-C, maximum 5V/3A
Other front USB 1 × USB 5Gbps header for 2 ports; 2 × USB 2.0 headers for 4 ports
Lighting 3 × Addressable RGB Gen 2 headers / Aura Sync
Other headers 1 × Clear CMOS / 1 × COM / 1 × front audio / 1 × S/PDIF out / 1 × SPI TPM (14-1 pin) / 1 × system panel (10-1 pin)
Build & firmware
Form factor / dimensions micro-ATX / 23.6 × 22.9cm
Protection 5X Protection III: DIGI+ VRM, LANGuard, overvoltage protection, SafeSlot Core+, stainless-steel rear I/O
Installation aids Q-Dashboard / Q-DIMM / Q-LED / Q-Slot
BIOS 32MB (256Mb) Flash ROM, UEFI AMI; EZ Flash / CrashFree BIOS 3
Manageability WOL by PME / PXE
Operating systems Windows 11 / Windows 10 64-bit
Software utilities Armoury Crate, Aura Creator, Aura Sync, Fan Xpert 2+, ASUS DriverHub, MB Manager, AI Advisor, CPU-Z, TurboV Core

Frequently Asked Questions

Which processors can I use?
ASUS lists Ryzen 9000, 8000 and 7000 AM5 desktop processors up to 120W. Confirm the exact CPU and BIOS in the support list.
Do the display ports work with every CPU?
No. They require a processor with integrated graphics; otherwise install a compatible graphics card and connect the monitor to that card.
Are the front USB ports already sockets on the board?
They are internal connectors for compatible case USB ports. The board provides six exposed rear USB Type-A ports.
Singular Expert Insight
Match the processor’s support entry and power limit before considering headline memory speed. Then check case dimensions, required front connectors and SSD slot generation so the complete build fits your needs. Ask Singular about your AM5 build

Buyer’s Guide

✓ 

Buy it if

 You are building a compact AM5 desktop within the verified CPU power limit.
✕ 

Skip it if

 Your CPU exceeds the support limit or you require built-in wireless networking.
→ 

Also consider

 Select a supported CPU, DDR5 kit, case, cooler, PSU and storage together.
The support list and BIOS determine exact CPU compatibility; advertised memory OC rates are not guaranteed. Windows 11 and Windows 10 64-bit are listed by ASUS, subject to CPU and driver support.

Features - ASUS - 90MB1PT0-M0EAY0

CPU Socket
  • Socket AM5
Interface
  • USB Type-C,
  • USB3.0,
  • USB2.0,
  • M.2,
  • SATA,
  • Ethernet
More Details
Product Code
04:590448
EAN Code
4711636560696
Manufacturer
ASUS
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