MSI B550-A PRO

Board code MS-7C56 Motherboard, from 2020 102 hardware reports

Memory

Up to 128 GB

4 full-size slots

SSD

1+ M.2

At least 1 M.2 SSD slot

SSD length

Coming next

Checked from separate sources

Upgradable

Yes. 4 slots, up to 128 GB seen working.

It takes DDR4-3200 full-size sticks (DIMM).

Slots: 4 DIMM slots
Type: DDR4-3200 288-pin DIMM
Most seen working: 128 GB in two or more machines
Firmware says: 128 GB maximum
SSD slots: At least 1 M.2 SSD slot listed by the firmware
How sure: 102 of 102 reports show this layout

See 32 GB DDR4-3200 DIMM on AmazonOpens an Amazon search for this exact spec.

Worked out from 102 hardware reports of this motherboard. Sources and method. Updated 9 Nov 2026.

4 full-size slots

Illustration

Questions

Can I upgrade the RAM in the MSI B550-A PRO?

Yes. 4 slots, up to 128 GB seen working. It takes DDR4-3200 full-size sticks (DIMM).

What type of RAM does the MSI B550-A PRO use?

DDR4-3200 full-size sticks (DIMM, 288-pin).

How much RAM can the MSI B550-A PRO take?

Machines in the reports run up to 128 GB. That matches the 128 GB maximum the firmware reports.

Does the MSI B550-A PRO have an M.2 SSD slot?

Yes. The firmware lists at least 1 M.2 SSD slot, in 102 reports. Some firmware leaves a slot out, so there may be more.

Is this my motherboard?

The model name is printed on the board, usually between the memory slots or near the CPU socket. In Windows, open System Information and look at "BaseBoard Product"; it should read B550-A PRO or MS-7C56.