ASUS PRIME B840M-A-CSM AMD Micro-ATX Motherboard
ASUS PRIME B840M-A-CSM AMD Micro-ATX Motherboard
Scan code: LN154673 Manufacturer code: 90MB1J10-M0EAYC
£189.98
Get it Tomorrow, 15 FebIn stock
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ASUS PRIME B840M-A-CSM AMD Micro-ATX Motherboard

ASUS PRIME B840M-A-CSM, AMD B840, AM5, DDR5, PCIe 4.0, 3x M.2, 2.5GbE, USB 10Gbps, mATX

Scan code: LN154673 Manufacturer code: 90MB1J10-M0EAYC
£189.98
£5.48 NEXT DAY DELIVERY
Order now and get it tomorrow (upgrade to Saturday delivery at checkout)
Get it Tomorrow, 15 FebIn stock

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Product Overview

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 optimisations 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.


AI Advisor

ASUS AI Advisor allows users to explore the functionality and advanced features of ASUS motherboards in a simple and straightforward way.


Digital Power Design

PRIME B840M-A features an 8+2+1 phase power design with discrete MOSFETs, ensuring efficient and stable power delivery for AMD processors plus steady performance for day-to-day use.


Multi-Layered Printed Circuit Board Design

The multi-layered printed circuit board design quickly dissipates heat around the voltage regulators to improve overall system stability and provide the CPU with more overclocking headroom.


Power Saving Function

The Power Saving function contains several settings to easily optimize power consumption and maximize energy savings. You can enable a CPU power limit, darken Aura lighting and set the fan profile to a Power Saving mode. You can also toggle the Power Saver plan that is built into Microsoft Windows.


Digi+ Voltage

The Digi+ voltage-regulator module (VRM) delivers real-time control over voltage droop, automatically switching frequency and power-efficiency settings.


Enhanced DDR5 Performance

Comprehensive memory tuning options are the cornerstone of PRIME motherboards. The PRIME B840M-A maximizes the potential of your DDR5 modules, from entry-level to extreme-speed kits.

For entry-level modules without EXPO support, ASUS Enhanced Memory Profile (AEMP) automatically detects memory chips and provides optimized profiles for enhanced performance.

For those looking to surpass stock DDR5 speeds, the PRIME B840M-A offers extensive AMD Extended Profiles for Overclocking (EXPO™) support and a wide array of UEFI settings for further performance tweaks.


Three M.2 Slots (up to 64 Gbps)

PRIME B840M-A offers a total of three M.2 slots, including two that support data-transfer speeds of up to 64 Gbps via PCIe 4.0, and one that supports PCIe 3.0. This enables quicker boot-up and app load times with OS or application drives.


Cooler by Design

The PRIME B840M-A motherboard is engineered with multiple onboard heatsinks and an array of hybrid fan headers to help ensure your rig stays cool and stable under intense workloads.


VRM Heatsink and Thermal Pads

Massive VRM heatsink and essential thermal pads improve heat transfer from the MOSFETs and chokes for better cooling performance.


Multiple Temperature Sources

Each header can dynamically reference three thermal sensors. Fan Xpert 2+ lets you to map the temperature of supported ASUS graphics cards to optimize cooling for GPU- and CPU-intensive tasks.


M.2 Heatsink

One M.2 heatsink takes care of the M.2 slot, preventing throttling that can occur with M.2 storage during extended transfers.


Passive Chipset Heatsink

An aluminium passive chipset heatsink ensures optimal cooling and stable performance. It is more durable and longer-lasting than heatsinks with fans, which can be vulnerable to the buildup of dust and debris.


Smart Protection

A dedicated integrated circuit protects each fan header from overheating and excess current.


ASUS Fan Xpert 2+

ASUS Fan Xpert 2+ software provides comprehensive control over fans. An Auto-Tuning mode intelligently configures all parameters with a single click. There’s also an Extreme Quiet mode that reduces chassis fan speeds to below the default minimum to keep your system whisper-quiet when performing light tasks. Fans can also be controlled via the UEFI BIOS.


Cooler Compatibility

ASUS AIO coolers offer robust performance, high overclocking potential, bold aesthetics and customizable functionality for new motherboards, empowering you to build your dream gaming rig.


Empowering Connections

>This motherboard offers a versatile range of connectivity, including support for PCIe 4.0 slot and an arsenal of USB ports which includes Type-C connections.


Realtek 2.5 Gb Ethernet

Realtek 2.5 Gb Ethernet reduces CPU overhead and offers exceptionally high TCP and UDP throughput for faster, smoother data transfers.


Front USB 5Gbps Type-C

This motherboard features a USB 5Gbps Type-C front panel connector for speedy data transfers of up to 5Gbps.


Personalisation

The PRIME B840M-A enhances the user experience across the board, from simplifying BIOS setting adjustments to offering customisable RGB lighting controls for a uniquely personal system aesthetic.


UEFI BIOS

The UEFI interface delivers easy-to-use configuration options for PC beginners, and advanced features for veterans.


Aura Sync

Complete RGB lighting control for enthusiast systems, ensuring seamless synchronisation with compatible hardware.

Features

• AMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors.
• AMD B840 Chipset.
• 4x DIMM slots, max. 192GB, DDR5.
• PCIe 4.0 x16.
• 3x M.2 slots and 4x SATA 6Gb/s ports.
• Micro-ATX Form Factor.

Specifications
Core Specifications
Edition PRIME B840M-A
Form Factor MicroATX
CPU Socket AM5
Chipset AMD B840
RAM Memory Support
Memory Type DDR5
Memory Channel  
Memory Type (ECC) ECC/Non-ECC
Memory Type (R/U) UDIMM (Unbuffered)
Memory Speed (Mhz) DDR5 - 7600(OC)
Max. Memory Capacity 192GB (4x48GB)
Audio
Audio 7.1 Channel HD Audio
Graphics Support
Primary GPU Interface PCIe 4.0 (x16)
NVIDIA SLI Support N/A
AMD CrossFire Support N/A
Integrated Graphics  
On-Board Graphics Connectors None
Internal Connectivity
Expansion Slots
  • 1 x M.2, 22-42/60/80, PCIe Gen4x4
  • 1 x M.2, 22-80, PCIe Gen3
  • 1 x M.2, 22-80, PCIe Gen4x4
  • 2 x PCIe 3.0 x16
  • 1 x PCIe 4.0 x16
SATA Support N/A
RAID Support via  
Storage Mode Support
  • RAID 0
  • RAID 1
  • RAID 10
  • RAID 5
Internal I/O
  • 1 x 24-pin (Power)
  • 2 x 4-pin CHA_FAN connector
  • 1 x 4-pin CPU Fan Connector
  • 1 x 4-pin CPU OPT Fan Connector
  • 1 x 8-pin (Power)
  • 3 x Addressable Gen 2 Header
  • 1 x Clear CMOS Header
  • 1 x Front Panel Audio Header
  • 1 x Front Panel Connector
  • 1 x S/PDIF-Out Header
  • 4 x SATA III - 6Gb/s
  • 1 x Serial (COM) Header
  • 1 x TPM (SPI_TPM) header
External Connectivity
Network Interface Type Wired 2.5 Gigabit LAN
Network Chip/Modules 1 x Realtek (2.5GbE LAN)
Rear I/O Connectors
  • 1 x 10/100/1000/2500 (LAN)
  • 1 x BIOS Flashback Button
  • 2 x DisplayPort
  • 1 x HDMI
  • 1 x Line In
  • 1 x Line Out
  • 1 x Mic-In
  • 4 x USB 2.0
  • 1 x USB 3.1 Gen1 Type-C
  • 2 x USB 3.2
Additional Specifications
Water Cooled No
Cooling Passive Heatsinks
QPI Speed N/A
Board Dimensions 244x244x50mm ( L x W x H) mm
Note  
Additional Information
Scan Code LN154673
Model Number 90MB1J10-M0EAYC
GTIN 4711387797204
Warranty

Please note your statutory rights are not affected.

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Warranty information has not yet been updated for this product. For further information please call 01204 474747.

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Buying Guide
Need help choosing the right board? Read our AMD Motherboard Buying Guide
ASUS PRIME B840M-A-CSM AMD Micro-ATX Motherboard
ASUS PRIME B840M-A-CSM AMD Micro-ATX Motherboard