MSI MS-B1591

Motherboard, from 2017 3 hardware reports

Memory

Up to 16 GB

4 laptop-size slots

SSD slots

Coming next

Checked from separate sources

Upgradable

Yes. 4 slots, up to 16 GB seen working.

It takes DDR4-2133 laptop-size sticks (SO-DIMM).

Slots: 4 SO-DIMM slots
Type: DDR4-2133 260-pin SO-DIMM
Most seen working: 16 GB in two or more machines
Firmware says: 64 GB maximum (often wrong, so we show what machines run)
How sure: 3 of 3 reports show this layout

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

Worked out from 3 hardware reports of this motherboard. Sources and method. Updated 9 Nov 2026.

4 laptop-size slots

Illustration

Questions

Can I upgrade the RAM in the MSI MS-B1591?

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

What type of RAM does the MSI MS-B1591 use?

DDR4-2133 laptop-size sticks (SO-DIMM, 260-pin).

How much RAM can the MSI MS-B1591 take?

Machines in the reports run up to 16 GB. The firmware reports a maximum of 64 GB, a figure that is often wrong.

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 MS-B1591.