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MSI PRO B550M-B
MSI · Motherboard

MSI PRO B550M-B

B550 · AM4 · mATX · DDR4

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  • Chipset B550
  • Form factor mATX
  • Memory slots 2
  • Max memory 64 GB
  • Socket AM4
  • Memory type DDR4

MSI PRO B550M-B is a mATX and B550 chipset motherboard for AM4 processors and DDR4 memory. It came out in 2026.

Released
2026-06-03
Socket
AM4

Specifications

Key specs

Chipset
B550
Form factor
mATX
Memory slots
2
Max memory
64 GB
Socket
AM4
Memory type
DDR4
Released
2026-06-03
Part number
PRO B550M-B
EAN / UPC
4711377428927

Processor

Processor manufacturer
AMD
Processor socket
Socket AM4
Compatible processor series
AMD Ryzen 3000 Series, AMD Ryzen 4000 Series, AMD Ryzen 5000 Series
Supported processor sockets
Socket AM4

Memory

Supported memory types
DDR4-SDRAM
Number of memory slots
2
Memory slots type
DIMM
Memory channels
Dual-channel
ECC сompatibility
Non-ECC
Supported memory clock speeds
2667,2800,2933,3000,3066,3200,3466,3600,3733,3866,4000,4133,4266,4400,4600 MHz
Supported memory clock speed (max)
4600 MHz
Maximum internal memory
64 GB
Unbuffered memory
Yes
View all specifications +8 more sectionsShow fewer specifications

Storage controllers

Supported storage drive interfaces
M.2, NVMe, PCI Express 3.0, PCI Express 4.0, SATA
Number of storage drives supported
6
RAID support
Yes
RAID levels
0, 1, 5, 10

Graphics

Parallel processing technology support
Not supported

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
Number of SATA connectors
4
Total number of SATA connectors
4
Front panel audio connector
Yes
Front panel connector
Yes
ATX Power connector (24-pin)
Yes
CPU fan connector
Yes
Chassis intrusion connector
Yes
TPM connector
Yes
RGB LED pin header
Yes

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
USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity
1
HDMI ports quantity
1
HDMI version
2.1
DisplayPorts quantity
1
DisplayPort version
1.2

Network

Ethernet LAN
Yes
Ethernet interface type
Gigabit Ethernet
LAN controller
Realtek RTL8111H

Features

Motherboard chipset
AMD B550
Audio chip
Realtek ALC897
Audio output channels
7.1 channels
Component for
PC
Motherboard form factor
micro ATX
Motherboard chipset family
AMD
Windows operating systems supported
Windows 10 x64, Windows 11 x64

Expansion slots

PCI Express x16 slots
1
PCI Express x16 (Gen 4.x) slots
1
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
22110
2nd M.2 highest PCI Express generation
3.0

BIOS

BIOS type
UEFI AMI
BIOS memory size
256 Mbit
ACPI version
6.0
System Management BIOS (SMBIOS) version
3.7

Check the manufacturer's page before buying.

Ready to buy? Get the MSI PRO B550M-B at today's price.Buy now on Amazon

Compatible processors

AM4 socket

Compatible memory

DDR4

About this product

PRO B550M-B is engineered with PCIe 4.0 M.2, Frozr AI Cooling, and Front Type-C, ready for the AMD Ryzen™ 5000 series processors. 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 circuitry ensure the case standoff keep out zones are pure and clean. Moreover, the protective paint is printed around each screw hole to prevent parts from being scratched or damaged to the motherboard.

EZ DEBUG LED

Onboard LEDs will indicate the source of the problem so you know exactly where to look to get up and running again. A host of features inject artificial intelligence into key aspects of your computing experience to make smarter, real-time optimizations. The MSI Center offers a clean, minimal interface to customize and manage your PC settings. The AI Engine, for example, automatically adjusts settings based on the applications you're using, ensuring seamless performance.

User manual (PDF) · Datasheet (PDF)

PRO B550M-B vs similar motherboards

MSI PRO B550M-BASUS PRIME B550M-K WIFIASUS PRIME B550M-K ARGBMSI B450M-A PRO MAX II (mATX)
ChipsetB550B550B550B450
Form factormATXmATXmATXmATX
Memory slots2222
Max memory64 GB64 GB64 GB64 GB
SocketAM4AM4AM4AM4
Memory typeDDR4DDR4DDR4DDR4
Released202620262023—

Questions about the PRO B550M-B

What are the main specs of the MSI PRO B550M-B?

B550, AM4, mATX, DDR4, 2 RAM slots.

Which chipset does the MSI PRO B550M-B use?

B550.

What form factor is the MSI PRO B550M-B?

mATX.

Which socket does the MSI PRO B550M-B use?

AM4.

When did the MSI PRO B550M-B come out?

It was released in 2026/06 (MSI).

With photos

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