ASUS X401U
Laptop, from 2012 6 hardware reports
Memory
Up to 4 GB
1 laptop-size slot
SSD and charger
Coming next
Checked from separate sources
Upgradable
Yes. One slot, up to 4 GB seen working.
It takes DDR3-1066 laptop-size sticks (SO-DIMM).
- Slots
- 1 SO-DIMM slot
- Type
- DDR3-1066 204-pin SO-DIMM
- Most seen working
- 4 GB in two or more machines
- Firmware says
- 2 GB maximum (often wrong, so we show what machines run)
- How sure
- 4 of 6 reports show this layout
See 4 GB DDR3-1066 SO-DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 6 hardware reports of this laptop. Sources and method. Updated 9 Nov 2026.
1 laptop-size slot
Illustration Questions
Can I upgrade the RAM in the ASUS X401U?
Yes. One slot, up to 4 GB seen working. It takes DDR3-1066 laptop-size sticks (SO-DIMM).
What type of RAM does the ASUS X401U use?
DDR3-1066 laptop-size sticks (SO-DIMM, 204-pin).
How much RAM can the ASUS X401U take?
Machines in the reports run up to 4 GB. The firmware reports a maximum of 2 GB, a figure that is often wrong.
Is this my laptop?
Check the model name on the label underneath. It should read X401U.