ASRock B660M-STX
Only 2 machines reported so far, so this answer rests on few examples. Check the label or open the panel before you buy.
Yes. 2 slots, up to 64 GB seen working.
It takes DDR4-3200 laptop-size sticks (SO-DIMM).
- Slots
- 2 SO-DIMM slots
- Type
- DDR4-3200 260-pin SO-DIMM
- Most seen working
- 64 GB in two or more machines
- Firmware says
- 64 GB maximum
- SSD slots
- At least 2 M.2 SSD slots listed by the firmware
- How sure
- 2 of 2 reports show this layout
Worked out from 2 hardware reports of this motherboard. Sources and method. Updated 9 Nov 2026.
Questions
Can I upgrade the RAM in the ASRock B660M-STX?
Yes. 2 slots, up to 64 GB seen working. It takes DDR4-3200 laptop-size sticks (SO-DIMM).
What type of RAM does the ASRock B660M-STX use?
DDR4-3200 laptop-size sticks (SO-DIMM, 260-pin).
How much RAM can the ASRock B660M-STX take?
Machines in the reports run up to 64 GB. That matches the 64 GB maximum the firmware reports.
Does the ASRock B660M-STX have an M.2 SSD slot?
Yes. The firmware lists at least 2 M.2 SSD slots, in 2 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 B660M-STX.