MSI B550-A PRO Motherboard, AMD Ryzen AM4, 4xDDR4, support up to 128GB, 1xPCIe 4.0/3.0 x16slot, 6xSATA 6Gb, 2xUSBGen2, 5xUSB3.2Gen1, 8xUSB2.0, HDMI | B550-A PRO

MSI B550-A PRO Motherboard, AMD Ryzen AM4, 4xDDR4, support up to 128GB, 1xPCIe 4.0/3.0 x16slot, 6xSATA 6Gb, 2xUSBGen2, 5xUSB3.2Gen1, 8xUSB2.0, HDMI

MSI B550-A PRO PRO series helps users work smarter by delivering an efficient and productive experience. Featuring stable functionality and high-quality assembly, PRO series motherboards provide not only optimized professional workflows but also less troubleshooting and longevity.

With more cores’ processors, thermal and power design is more important to make sure the temperature keeps lower. MSI extended PWM heatsink with 7W/mK thermal pad ensures even high-end processors to run in full speed with MSI motherboards.

SPECIFICATIONS

Model Name
B550-A PRO

CPU Support
Support for 3rd Gen AMD® Ryzenth processors and future AMD® Ryzen™ processors with BIOS update

CPU Socket
AMD Socket AM4

Chipset
AMD® B550 Chipset

Graphics Interface
1x PCIe 4.0 / 3.0 x16 slot + 1x PCIe 3.0 x16 slot
Support 2-way AMD® CrossFire™ Technology

Display Interface
DisplayPort, HDMI™ – Requires Processor Graphics

Memory Support
4 DIMMs, Dual Channel DDR4-4400 MHz (OC)

Expansion Slots
2x PCI-E 3.0 x1 slots

Storage
1 x M.2 Gen4 x4, 1 x M.2 Gen3 x4 slot
6x SATA 6Gb/s ports

USB ports
2x USB 3.2 Gen 2 10Gbps (1 Type-A + 1 Type-C)
+ 5x USB 3.2 Gen 1 5Gbps (4 Type-A+ 1 Type-C)
+ 8 x USB 2.0

LAN
Realtek® RTL8111H Gigabit LAN

Audio
8-Channel (7.1) HD Audio with Audio Boost

Product Last Updated: 23/11/2025

* Whilst we endevour to have the correct information on our products provided from the supplier/manufacturer errors do occur. If you would like to double check the information, please feel free to contact us and we will be more than happy to confirm information on the item prior to purchase. In the event that product information is incorrect due to information we received from our supplier or manufacturer, we do not take responsibility or be held liable for damage(s) or loss(s). We will work with you and do our best to make the best of a bad situation and work with our supplier(s) and/or manufacturer(s) to supply the correct information for the item purchased etc..