MSI PRO B840M-B AM5 DDR5 PCIe 4.0 microATX Motherboard
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MSI PRO B840M-B AM5 DDR5 PCIe 4.0 microATX Motherboard
Scan code: LN165206 Manufacturer code: PRO B840M-B
Was: £89.99
£79.99
Add To Basket
Get it Tomorrow, 24 JunIn stock
  • Thumbnail 1 : MSI PRO B840M-B AM5 DDR5 PCIe 4.0 microATX Motherboard
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Offer

MSI PRO B840M-B AM5 DDR5 PCIe 4.0 microATX Motherboard

MSI PRO B840M-B, AMD B840, AM5, DDR5, PCIe 4.0, 2x M.2, 2.5GbE, USB 3.2 Gen1, AMD EXPO, mATX
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MORE INFO

Scan code: LN165206 Manufacturer code: PRO B840M-B
Was: £89.99£79.99
£5.48 Next day delivery
Order now and get it tomorrow, Wed 24th Jun
Add To Basket
Get it Tomorrow, 24 JunIn stock
Pay in 3 interest-free payments of £26.67

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  • By DPD On 24th Jun Have your parcel delivered by DPD to your specified address. Receive SMS with one-hour delivery window | £5.48 Receive SMS with one-hour delivery window Weekend, timed and European delivery options are available at checkout
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B840M-B DDR5 PCIe 4.0 AMD MicroATX Motherboard from MSI

B840-P

Empower Your WorkflowThe MSI PRO B840M-B delivers the dependable platform modern professionals and creators need for AMD’s latest AM5 processors. Designed around the AMD B840 chipset, this motherboard focuses on stability, efficiency, and long-term durability — the essentials for business systems, creative workstations, and everyday productivity PCs. It’s the foundation for those who value consistent performance and zero fuss.

B840AMD Chipset

AM5CPU Socket

DDR5 DIMMMax. 128GB (2 x 64GB)

Micro-ATXForm Factor

Incredible Power Design

7+2+1 DRPS POWER DESIGN Unlock and maintain peak performance with the flagship VRM design featuring 7+2+1 digital power phases. Equipped with dual power connectors, this motherboard is fully prepared to handle the demands of modern processors.

VRM Power Design

7 Vcore Power - SPS P-PAK

2 SOC Power

1 Misc Power

Optimised PCB

Optimised PCB The PCB design has been optimised to enhance bandwidth and accelerate transfer speeds, ensuring reliable circuit transmission. 6 PCB Layers Server-grade PCB material 2oz Thickened Copper

High Performance Memory Support

DDR5 Memory Support

Unleash World-Class DDR5 Performance Experience a significant leap in DDR performance with the latest DDR5 memory. Paired with a dedicated SMT welding process and MSI Memory Boost technology, the B840M-B is primed to deliver world-class memory performance.

EXPO / A-XMP Support

Memory Boost

SMT Process

Thermals Done Your Way

DIY 2.0

DIY 2.0 Connect and synchronise with MSI coolers and cases using strategically placed pin-header locations, including a dedicated pump-fan header.
For CPU Cooler
For System Fan

A Breakthrough in Bandwidth

x5 PCIe 2280/110 Slots

Dual M.2 Slots MSI utilises high-speed M.2 slots with PCIe Gen 4, enabling faster load times and efficient data transfers for SSDs.

x2 M.2 PCIe 4.0 x4 (2280/2260)

x5 PCIe 2280/110 Slots

Packed with PCIe For PCIe, MSI motherboards maximise bandwidth with reinforced slots and advanced signal integrity, ensuring top-tier performance for GPUs and expansion cards.

x1 Steel Armoured Full-Length PCIe 4.0 (x16)
x1 Full-Length PCIe 3.0 x1

Peripheral Power

Clear CMOS Button


HDMI™


VGA


USB 5Gbps Type-A

2.5G LAN


Audio connectors


Flash BIOS Button


USB 2.0

Specifications
Core Specifications
Edition PRO B840M-B
Form Factor MicroATX
CPU Socket AM5
Chipset AMD B840
RAM Memory Support
Memory Type DDR5
Memory Channel Dual (2)
Memory Type (ECC) Non-ECC
Memory Type (R/U) UDIMM (Unbuffered)
Memory Speed (Mhz)
  • DDR5 - 4800
  • DDR5 - 5600
  • DDR5 - 5600(OC)
  • DDR5 - 8000(OC)
Max. Memory Capacity 128GB (2x64GB)
Audio
Audio Realtek ALC897 7.1 HD Audio
Graphics Support
Primary GPU Interface PCIe 4.0 (x16)
NVIDIA SLI Support Not Supported
AMD CrossFire Support Not Supported
Integrated Graphics Requires Processor Graphics or Discrete GPU
On-Board Graphics Connectors
  • D-Sub (VGA)
  • HDMI 2.1
Internal Connectivity
Expansion Slots
  • 2 x M.2, 22-60/80, PCIe Gen4x4
  • 1 x PCIe 3.0 x1
  • 1 x PCIe 4.0 x16
  • 4 x SATA 6GB/s
SATA Support SATA3
RAID Support via SATA3 / M.2
Storage Mode Support
  • RAID 0
  • RAID 1
  • RAID 10
Internal I/O
  • 1 x 24-pin (Power)
  • 1 x 4-pin CPU Fan Connector
  • 2 x 4-pin System Fan Connector
  • 1 x 8-pin (Power)
  • 3 x Addressable Gen 2 Header
  • 1 x Front Panel Audio Header
  • 2 x Front Panel Connector
  • 1 x RGB LED connector
  • 1 x Serial (COM) Header
  • 1 x TPM 2.0 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 BIOS Flashback Button
  • 1 x Clear CMOS Button
  • 1 x HDMI 2.1
  • 1 x Line In
  • 1 x Line Out
  • 1 x Mic-In
  • 1 x RJ-45
  • 4 x USB 2.0
  • 2 x USB 3.2 Gen1 Type-A
  • 1 x VGA
Additional Specifications
Water Cooled No
Cooling Passive Heatsinks
QPI Speed N/A
Board Dimensions 226 x 243.84 mm
Note  
Additional Information
Scan Code LN165206
Model Number PRO B840M-B
GTIN 4711377360166
Warranty

Please note your statutory rights are not affected.

For further information regarding Scan's warranty procedure please see our terms and conditions

Details
Duration:
36 months
Type:
Direct
DOA Period:
7 days
Manufacturer Contact Details
Manufacturer:
MSI
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Buying Guide
Need help choosing the right board? Read our AMD Motherboard Buying Guide
MSI PRO B840M-B AM5 DDR5 PCIe 4.0 microATX Motherboard
MSI PRO B840M-B AM5 DDR5 PCIe 4.0 microATX Motherboard MSI PRO B840M-B AM5 DDR5 PCIe 4.0 microATX Motherboard MSI PRO B840M-B AM5 DDR5 PCIe 4.0 microATX Motherboard MSI PRO B840M-B AM5 DDR5 PCIe 4.0 microATX Motherboard
MSI PRO B840M-B AM5 DDR5 PCIe 4.0 microATX Motherboard