MSI
MSI B840M-B PRO AMD AM5 microATX Motherboard
Build your next PC with the MSI B840M-B PRO motherboard, engineered for the latest AMD Ryzen 9000 series processors on the AM5 socket. It supports up to 128GB of DDR5 memory across two DIMM slots for robust multitasking. Storage options include two M.2 slots, one with PCIe 4.0 support, and four SATA 6Gb/s ports. Experience high-speed networking with 2.5G LAN and convenient front panel connectivity, including a Type-C header. This compact microATX board is ideal for versatile and modern builds, backed by a 3-year limited warranty.
$129.99
Owner Satisfaction
4.4
/ 5
Category Rank
286
/ 753
#286 in Motherboards
Price vs Category Average
-61%
Below average
Chipset
650
/ AMD B
Who it's for
- Next-Gen Platform Support
- Compact microATX Design
- Excellent Price-to-Performance Ratio
Who should skip it
- Limited Expansion Slots
- Basic VRM Design
- Minimal Premium Features
Key Specs
Chipset
AMD B650
CPU Socket
AM5
Memory Support
Dual Channel DDR5 up to 128GB
Storage
2 x M.2 (PCIe 4.0 support), 4 x SATA 6Gb/s
LAN Speed
2500Mbps
Expansion Slots
1 x PCIe 4.0 x16, 1 x PCIe x1
Form Factor
Micro-ATX
Dimensions
9.60 in. x 8.90 in.
Features
- Supports latest AMD Ryzen 9000 series CPUs.
- Fast 2.5G LAN for high-speed networking.
- EZ PCIe Clip II simplifies graphics card installation.
- Front panel Type-C header for modern connectivity.
- Dual Channel DDR5 memory support up to 128GB.
- Includes 3 addressable RGB headers for customization.
- Robust Realtek ALC897 7.1 channel audio.
- Compact microATX form factor for versatile builds.
What customers say
The MSI B840M-B PRO is highly regarded as an excellent value entry point into the AM5 ecosystem, perfectly serving budget-conscious builders. Customers praise its stability and essential features for modern Ryzen 7000/8000 series CPUs without demanding a premium price. The microATX size supports compact builds, and the BIOS is intuitive for easy setup. While it performs reliably for everyday use and modest gaming, users note clear limitations. Connectivity is minimal, featuring few M.2 slots and basic rear I/O, restricting future expansion. The VRM design is adequate for mid-range CPUs but unsuitable for heavy overclocking or top-tier Ryzen 9 processors. Overall, this board earns high marks for delivering exactly what it promises: affordability and stability over advanced features.
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