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.

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.

DIRECT 7+2+1 POWER DESIGN
Unleash and sustain the maximum performance with a VRM design built with a total of 7+2+1 digital power phases. With an 8-pin power connector, PRO B840M-B is ready for the challenge of heavy-loading tasks.

Chipset Heatsink
The chipset heatsink is designed to reduce dust and noise and capable of maintaining high efficiency of heat dissipation.

HIGH-BANDWIDTH AND LOW-LATENCY NETWORK
MSI’s premium network solution provides incredible data transfer speed for demanding users.

Specification

Product
Product id	994313
Brand	MSI Micro-Star International
Partnr	PRO B840M-B
EAN/UPC code	4711377360166
Processor
Processor manufacturer	AMD
Processor socket	Socket AM5
Compatible processor series	AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
Supported processor sockets	Socket AM5
Memory
Supported memory types	DDR5-SDRAM
Number of memory slots	2
Memory slots type	DIMM
Memory channels	Dual-channel
ECC сompatibility	non-ECC
Supported memory clock speeds	4800, 5600, 8000 MHz
Maximum internal memory	128 GB
Supported memory clock speed (max)	8000 MHz
Storage controllers
Supported storage drive types	HDD & SSD
Supported storage drive interfaces	M.2, Micro SATA III
Number of HDDs supported	4
Number of storage drives supported	6
RAID levels	0, 1, 10
RAID support	Y
Graphics
On-board graphics adapter	N
Internal I/O
USB 2.0 connectors	4
USB 3.2 Gen 1 (3.1 Gen 1) connectors	2
USB 3.2 Gen 2 (3.1 Gen 2) connectors	1
Number of SATA III connectors	4
Total number of SATA connectors	4
Number of chassis fan connectors	5
Number of CPU fan connectors	1
Number of water pump connectors	1
RGB LED pin header	Y
Number of RGB LED pin headers	3
Rear panel I/O ports
USB 2.0 ports quantity	2
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity	4
Ethernet LAN (RJ-45) ports	1
HDMI ports quantity	1
HDMI version	2.1
Network
Ethernet LAN	Y
Ethernet interface type	2.5 Gigabit Ethernet
LAN controller	Realtek RTL8125D
Wi-Fi	N
Features
Component for	PC
Motherboard form factor	Micro ATX
Motherboard chipset family	AMD
Motherboard chipset	AMD B840
Audio chip	Realtek ALC897
Audio output channels	7.1 kanalen
Product colour	Black
Windows operating systems supported	Windows 11 x64
Expansion slots
PCI Express x16 slots	2
Number of M.2 (M) slots	2
1st M.2 largest key size	2280
1st M.2 highest PCI Express generation	4.0
2nd M.2 largest key size	2280
2nd M.2 highest PCI Express generation	4.0
BIOS
BIOS type	UEFI AMI
BIOS memory size	256 Mbit
ACPI version	6.5
System Management BIOS (SMBIOS) version	3.7
Weight & dimensions
Width	226 mm
Depth	243.8 mm