MSI PRO B840M-B AM5 mATX Motherboard

BH #MSPROB840MB • MFR #PRO B840M-B
Print
MSI PRO B840M-B AM5 mATX Motherboard
Key Features
  • mATX Form Factor
  • AMD B840 Chipset
  • AM5 Socket
  • Two Dual-Channel DDR5 Slots
Boost your productivity by using the MSI PRO B840M-B AM5 mATX Motherboard as the foundation of your compact computer build. Supporting AMD 9000, 8000, and 7000 series processors with the AM5 socket, you can outfit this motherboard to smoothly handle demanding applications and video editing workloads.
More Details
Special Order
Expected availability: 2-4 Weeks
No Store Display
Free Standard Shipping
Protect Your Gear
Add a protection plan from $8.99
Ask an Expert
800-606-6969

MSI PRO B840M-B Overview

Boost your productivity by using the MSI PRO B840M-B AM5 mATX Motherboard as the foundation of your compact computer build. Supporting AMD 9000, 8000, and 7000 series processors with the AM5 socket, you can outfit this motherboard to smoothly handle demanding applications and video editing workloads.

Designed to help simplify builds, MSI's EZ technology makes it easy to install two M.2 PCIe 4.0 SSDs to store your applications and important files. There are also four SATA III connectors available. The two DDR5 DIMM slots support up to 128GB, reaching up to 8000 MT/s overclocked speeds. With one PCIe 4.0 x16 slot and a PCIe 3.0 x1 slot, you can install powerful graphics cards and other compatible expansions.

The rear panel features four USB-A 3.2 Gen 1 ports that can transfer up to 5 Gb/s with compatible devices. There are also two USB 2.0 ports. A 2.5 Gb/s Ethernet port provides you with reliable connections to compatible wired network devices for smooth video streaming, web browsing, and file transfers. Windows 11 64-bit is required to take advantage of all the motherboard's features.

Enhanced Power
Unleash maximum CPU performance with a 7+2+1 digital power phase system.
EZ M.2 Clip II
MSI's EZ M.2 CLIP II makes SSD installation seamless. Insert the SSD into the M.2 slot and press it down to lock it in place with the clip. Flicking the clip outward lets you remove the SSD. Use the EZ M.2 Clip II remover tool to detach or reposition the clip on the motherboard.
EZ GPU Installation
The EZ PCIe Clip II, located on the first slot, features the rebounding force mechanism that allows for easy removal of the graphics card by pressing the tail-like lock with one finger. The Express Steel Armor slot is secured to the motherboard with extra solder points to support the weight of heavy graphics cards.
Flash BIOS
Flash the BIOS with only a connected power supply and a flash drive. No CPU or memory required.
Clear CMOS
Restore the BIOS to its default settings with the push of a button.
EZ Debug
Onboard LEDs and error code screen makes troubleshooting easier.
FROZR Cooling
An efficient chipset heatsink quickly dissipates heat to ensure optimal performance.
Audio Boost
Enjoy studio grade sound quality for immersive gaming experiences.
Mystic Light
Customize RGB lighting with a variety of effects and sync them with Mystic Light compatible peripherals.
AI PC Features
AI Engine
By learning your behavior, the MSI AI engine can optimize and adjust your system in real time, which saves you from having to perform manual changes.
AI LAN Manager
Optimizes network performance and minimizes latency for online experiences.
Frozr AI Cooling
Automatically adjusts fan duty to make sure the system stays cool and stable.
AI Boost
Overclock your NPU for improved AI performance.
UPC: 824142430972

MSI PRO B840M-B Specs

Key Specs
Chipset
AMD B840
CPU Socket
AM5
Memory Slots
2x 288-Pin
Memory Type Support
DDR5
M.2 Slots
22110 / 2280
Expansion Slots
1x PCIe 4.0 x16
1x PCIe 3.0 x1
Wi-Fi
Wi-Fi 6E (802.11ax)
Form Factor
Micro-ATX
CPU
Chipset
AMD B840
CPU Socket
AM5
Back Panel I/O
USB I/O
4x USB-A (USB 3.0 / 3.1/3.2 Gen 1)
2x USB-A (USB 2.0)
Thunderbolt I/O
No
Display I/O
1x HDMI Output
1x VGA Output
Audio I/O
3x 1/8" / 3.5 mm
Ethernet / Controller
1x Realtek 8125D 2.5Gigabit
Wi-Fi Antenna
2x Connector
Buttons
BIOS Flashback, Clear CMOS
Memory
Memory Slots
2x 288-Pin
Memory Type Support
DDR5
Maximum Capacity
128 GB
Channel Architecture
Dual Channel
ECC Support
Non-ECC Unbuffered
Storage Expansion
SATA
4x SATA III
M.2 Slots
1x M.2 (M Key) 2280/2260 (PCIe 4.0 x4)
1x M.2 (M Key) 22110/2280 (PCIe 4.0 x4)
Optane Memory Support
No
RAID Support
RAID 0, 1, 10 (SATA)
RAID 0, 1 (M.2)
Internal I/O
Expansion Slots
1x PCIe 4.0 x16
1x PCIe 3.0 x1
USB
1x USB 3.0 / 3.1/3.2 Gen 1 Header (Supports 2 USB-A Port)
2x USB 2.0 Header (Supports 4 USB-A Port)
Air Cooling
1x 4-Pin CPU
2x 4-Pin System
Power Connectors
1x 24-Pin Mainboard
1x 12V-2X6 (12VHPWR)
Security
Chassis Intrusion, TPM Module
LED Header
9x RGB
Audio
No
Diagnostics
Clear CMOS
BIOS
ROM
256 Mb
Front Panel I/O
Front Panel I/O
AAFP
Audio
Audio Codec
Realtek ALC897 (7.1-Channel)
DAC
No
Wireless
Wi-Fi
Wi-Fi 6E (802.11ax): Tri-Band (2.4, 5, & 6 GHz) with MU-MIMO Support
Bluetooth
Bluetooth 5.3
Software
OS Compatibility
Windows
Physical
Form Factor
Micro-ATX
Dimensions
9.6 x 8.9" / 244 x 226 mm

MSI PRO B840M-B Reviews

See any errors on this page?
Whatever You Need, We've Got It