ASRock A300M-STX

Motherboard, from 2018 32 hardware reports

Memory

Up to 32 GB

2 laptop-size slots

SSD slots

Coming next

Checked from separate sources

Upgradable

Yes. 2 slots, up to 32 GB seen working.

It takes DDR4-2666 laptop-size sticks (SO-DIMM).

Slots: 2 SO-DIMM slots
Type: DDR4-2666 260-pin SO-DIMM
Most seen working: 32 GB in two or more machines
Firmware says: 128 GB maximum (often wrong, so we show what machines run)
How sure: 32 of 32 reports show this layout

See 16 GB DDR4-2666 SO-DIMM on AmazonOpens an Amazon search for this exact spec.

Worked out from 32 hardware reports of this motherboard. Sources and method. Updated 9 Nov 2026.

2 laptop-size slots

Illustration

Questions

Can I upgrade the RAM in the ASRock A300M-STX?

Yes. 2 slots, up to 32 GB seen working. It takes DDR4-2666 laptop-size sticks (SO-DIMM).

What type of RAM does the ASRock A300M-STX use?

DDR4-2666 laptop-size sticks (SO-DIMM, 260-pin).

How much RAM can the ASRock A300M-STX take?

Machines in the reports run up to 32 GB. The firmware reports a maximum of 128 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 A300M-STX.