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Key Features

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

Manuals & Resources

MANUAL User Manual › DATASHEET Product Datasheet › BROCHURE Manufacturer Brochure › MANUAL Assembly Instructions › WARRANTY Warranty Information › DATASHEET Product Fiche › GUIDE Energy Guide › SAFETY Safety Data Sheet › SAFETY Safety Data Sheet (FR) › SAFETY COSHH Sheet › TOUR Product Tour › 360 360° Product View ›

MSI COMPUTER Motherboards

PRO B840M-B

Mfr # PROB840MB SKU 15065121 UPC 824142430972

$118.86 MSRP $129.99 Save 9%

Regular price saves you $11.13 against MSRP.

Available

Product Overview

PRO B840M-B

MSI (PROB840MB) Motherboards
MSI B840M-B Gaming Desktop Motherboard - AMD B840 Chipset - Socket AM5 - Micro ATX - Ryzen 7, Ryzen 9 Processor Supported - 128 GB DDR5 SDRAM Maximum RAM - DIMM, UDIMM - 2 x Memory Slots - Gigabit Ethernet - 2.5Gigabit Ethernet - HDMI - 4 x SATA Interfaces
MSI B840M-B Gaming Desktop Motherboard - AMD B840 Chipset - Socket AM5 - Micro ATX
Ryzen 7, Ryzen 9 Processor Supported - 128 GB DDR5 SDRAM Maximum RAM - DIMM, UDIMM - 2 x Memory Slots - Gigabit Ethernet - 2.5Gigabit Ethernet - HDMI - 4 x SATA Interfaces

Technical Specifications

Product Type	Gaming Desktop Motherboard
Manufacturer Part Number	PROB840MB
Maximum Memory Supported	128 GB
Limited Warranty	3 Year
Weight (Approximate)	2.20 lb
Form Factor	Micro ATX
Manufacturer	MSI
Product Model	B840M-B
Product Name	PRO B840M-B Gaming Desktop Motherboard
Processor Supported	Ryzen 7
Processor Supported	Ryzen 9
RAID Levels	0
RAID Levels	1
RAID Levels	10
Total Processor Supported	1
Controller Type	Serial ATA/600
Product Series	PRO
Processor Socket	Socket AM5
Brand Name	MSI
Memory Technology	DDR5 SDRAM
Height	2.6"
Width	9.6"
Depth	8.9"
Chipset Manufacturer	AMD
Chipset Model	B840
Number of Memory Slots	2
Audio Channels	7.1
Gigabit Ethernet	Yes
Number of SATA Interfaces	4
Number of PCI Express x1 Slots	1
Onboard Video	CPU Dependent Video
RAID Supported	Yes
Number of PCI Express x16 Slots	1
HDMI	Yes
VGA	Yes
Number of Network (RJ-45) Ports	1
Total Number of USB Ports	6
Number of USB 2.0 Ports	2
Total Number of Onboard USB Ports	7
Number of Onboard USB 2.0 Ports	4
PCI Express Standard	PCI Express 3.0
PCI Express Standard	PCI Express 4.0
Total Number of PCI Express Slots	2
Memory Form Factor	DIMM
Memory Form Factor	UDIMM
Total Number of Expansion Slots	2
Number of M.2 Interfaces	2
Memory Speed Supported	8000 MHz
Memory Speed Supported	7200 MHz
Memory Speed Supported	5600 MHz
Memory Speed Supported	4800 MHz
2.5Gigabit Ethernet	Yes
AI-powered	Yes

Marketing Information

3 years - Warranty period of 36 months applies on new retail MSI motherboards.

PRO B840M-B Gaming Desktop Motherboard
European Union Regulatory Notice
Quick Installation Guide
EZ M.2 Clip II Remover
2 x EZ M.2 Clip II
I/O Shield
SATA Cables

PRO B840M-B

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.

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.