MSI PRO B840M-B, AMD B840, AM5, Micro ATX, 2 DDR5, VGA, HDMI, 2.5G LAN, 2x M.2

MSI PRO B840M-B, AMD B840, AM5, Micro ATX, 2 DDR5, VGA, HDMI, 2.5G LAN, 2x M.2

£94.99

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The lowest price ( 11 December 2025 ): £94.99 SKU: PRO B840M-B Category: Brand:

Description

PRO B840M-B is engineered with many exclusive features of MSI, PCIe 4.0 M.2, EZ PCIe Clip II, 2.5G LAN, and Front Type-C, ready for the AMD Ryzen™ 9000 series processors.

  • Supports AMD Ryzen™ 9000 / 8000 / 7000 Series Desktop Processors
  • Supports DDR5 Memory, Dual Channel DDR5 8000+ MT/s (OC)
  • Ultra Performance: Direct 7+2+1 Power System with P-PAK, 8-pin CPU power connector, Core Boost, Memory Boost, 6-layer PCB made by 2oz thickened copper
  • EZ DIY: EZ M.2 Clip II and EZ PCIe Clip II
  • Lightning Fast Game experience: PCIe 4.0 slot and Lightning Gen 4 x4 M.2
  • 2.5G LAN: the remarkable solution for professional and multimedia use, delivering secure, stable, and high-speed networking and data transmission
  • Audio Boost: Reward your ears with studio grade sound quality for the most immersive gaming experience

Pro Business Elegance

The PRO Series is tailored to professionals from all walks of life. The lineup features impressive performance and high quality, while aiming to provide users incredible experience. Users who care about productivity and efficiency can definitely count on the MSI PRO Series to assist you with multitasking and increasing efficiency.
 
 

 

Ready for AI PC
 
MSI motherboards are designed with advanced hardware and technology, well-supporting the demanding computing usage of gaming and AI. Moreover, we also introduce AI to MSI Center and BIOS, making everything more effortless than before.
  • AI Engine – provides several categories for you to sync the applications you want to perform and automatically optimizing them to create a comfortable environment.
  • AI LAN Manager – optimizes networking performance and minimizes latency, providing a seamless online experience.
  • Frozr AI Cooling – automatically adjusts fan duty to make sure the system stays in cool, stable and high performance.
  • AI Boost – is an MSI exclusive feature. It overclocks NPU to improve higher AI performance.
 
 
 
EZ PCIe Clip II
Allows for easy removal of the graphics card by pressing the taillike lock with one finger, even in the cramped case spaces.

Latest DDR5 Memory

A huge step of DDR performance enhancement with the latest DDR5 memory and MSI Memory Boost technology.

Lightning Gen4 Solution

The latest Gen4 PCI-E and M.2 solution with up to 64GB/s bandwidth for maximum transfer speed.

2.5G Network Solution

Featuring premium 2.5G LAN to deliver better network experience.

Frozr AI Cooling

Detect CPU & GPU temperatures and automatically adjust system fan duty to a proper value.

EZ Debug LED

Easiest way to troubleshoot.

Memory Boost

Advanced technology to deliver pure data signals for the best performance, stability and compatibility.

Core Boost

With premium layout and fully digital power design to support more cores and provide better performance.

Audio Boost

Reward your ears with studio grade sound quality for the most immersive audio experience.

 

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Additional information

Product Type

Motherboard
Brand

MSI
Model

PRO B840M-B
Chipset

AMD B840
Socket

AM5
Form Factor

Micro ATX
Memory Type

DDR5
Memory Slots

2
Memory Speed

DDR5-8000+ MT/s (OC)
Memory Channels

Dual Channel
Pcie Slots

PCIe 4.0
M2 Slots

2
M2 Interface

PCIe 4.0 x4
Video Outputs

VGA, HDMI
Network

2.5G LAN
Usb Front Connector

Front Type-C
Power Design

7+2+1 Phase
Cpu Power Connector

8-pin
Pcb Layers

6
Pcb Copper Thickness

2oz
Supported Processors

AMD Ryzen 9000 Series, AMD Ryzen 8000 Series, AMD Ryzen 7000 Series
Audio Enhancement

Audio Boost
Special Features

EZ M.2 Clip II, EZ PCIe Clip II, Core Boost, Memory Boost, Frozr AI Cooling, EZ Debug LED, AI Engine, AI LAN Manager, AI Boost

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