MSI B550-A PRO[CEC]

Board code MS-7C56 Motherboard, from 2021 4 hardware reports

Memory

Up to 16 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 16 GB seen working.

It takes DDR4-2133 full-size sticks (DIMM).

Slots: 4 DIMM slots
Type: DDR4-2133 288-pin DIMM
Most seen working: 16 GB in two or more machines; one machine runs 32 GB
Firmware says: 128 GB maximum (often wrong, so we show what machines run)
SSD slots: At least 1 M.2 SSD slot listed by the firmware
How sure: 4 of 4 reports show this layout

See 4 GB DDR4-2133 DIMM on AmazonOpens an Amazon search for this exact spec.

Worked out from 4 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[CEC]?

Yes. 4 slots, up to 16 GB seen working. It takes DDR4-2133 full-size sticks (DIMM).

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

DDR4-2133 full-size sticks (DIMM, 288-pin).

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

Machines in the reports run up to 16 GB, and one runs 32 GB. The firmware reports a maximum of 128 GB, a figure that is often wrong.

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

Yes. The firmware lists at least 1 M.2 SSD slot, in 4 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[CEC] or MS-7C56.