MSI PRO B840M-B Motherboard

MSI PRO B840M-B AM5 DDR5 8000+ MT/s OC PCIe 4.0 x16 M.2 Gen4 2.5G LAN micro ATX

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ULTRA POWER - SUPPORTS THE LATEST RYZEN 9000 PROCESSORS IN HIGH PERFORMANCE - The PRO B840M-B employs a Direct 7 Phase (P-PAK) VRM for the AMD B840 chipset (AM5, Ryzen 9000 / 8000 / 7000) with MSI Core Boost technology for improved stability & performance
PASSIVE & AI COOLING - A chipset heatsinks provide passive cooling; Frozr AI cooling automatically adjusts system fan settings based on CPU & GPU temperatures
DDR5 MEMORY, PCIe 4.0 x16 SLOT - 2 x DDR5 DIMM slots enable extreme memory overclocking speeds (1DPC 1R, 8000+ MT/s OC); 1 x PCIe 4.0 x16 slot (64GB/s) with Steel Armor supports cutting-edge graphics cards
DOUBLE M.2 CONNECTORS - Storage options include 2 x M.2 Gen4 x4 64Gbps slots
HIGH-SPEED CONNECTIVITY - Network hardware includes 2.5Gbps LAN; Rear ports include USB 5Gbps Type-A and 7.1 HD Audio with Audio Boost

Specifications Overview

Model	PRO B840M-B 7E76-002R
Release Date	June 2025 * First availability for purchase, it may not correspond to the actual market launch date.
Socket	AM5
Form factor	Micro ATX
Chipset	AMD B840
Supported Memory	DDR5 4800Mhz 5600Mhz 7200Mhz 8000Mhz View compatible RAM ► * High clock speeds may require enabling the XMP profile in the motherboard BIOS ** RAM support may also depend on the CPU memory controller
ECC RAM Support	No
LAN Chipset	Realtek 8125 2.5G LAN
Max LAN Speed	2.5Gbps
SLI Support	No
CrossFire Support	No
RAID Support	Yes
Back Connect	No
Back I/O Ports	1x Clear CMOS Button 1x Flash BIOS Button 1x VGA 1x HDMI 1x 2.5G LAN 4x USB 5Gbps Type-A 2x USB 2.0 3x Audio Connectors.
Wireless LAN	No
PCI-Express x16 Slots	1
PCI-Express x4 Slots	0
PCI-Express x1 Slots	1
SATA 6 Gbps Ports	4
SATA Express Ports	0
M.2 Ports	2
M.2 Devices support	2260 / 2280 - M Key 2260 / 2280 - M Key
RAM Slots	2
Maximum Supported RAM	128 GB
Onboard USB 2.0	2
Onboard USB 3.2 Gen 1	1
Onboard USB 3.2 Gen 2	1
Onboard USB 3.2 Gen 2x2	0

	Old Name	Current Name	Branding	Data Speed	Port
USB 2.0	USB 2.0	USB 2.0	Hi-Speed USB	480 Mbit/s	diverse
USB 3.0	USB 3.1 Gen 1	USB 3.2 Gen 1x1	SuperSpeed USB	5 Gbit/s	diverse
USB 3.1	USB 3.1 Gen 2	USB 3.2 Gen 2x1	SuperSpeed USB 10Gbps	10 Gbit/s	diverse
USB 3.2	USB 3.2 Gen 2x2	USB 4.0 Gen 2x2	USB4 20Gbps	20 Gbit/s	only USB-C
USB4	USB 4.0 Gen 3x2	USB4 1.0	USB4 40Gbps	40 Gbit/s	only USB-C
USB4v2	USB 4.0 Gen 4	USB4 2.0	USB4 80Gbps	80-120 Gbit/s	only USB-C