Lenovo ThinkPad T431s
Type 20AC Laptop, from 2013 3 hardware reports
Memory
Up to 8 GB
1 laptop-size slot
SSD and charger
Coming next
Checked from separate sources
Upgradable
Yes. One slot, up to 8 GB seen working.
It takes DDR3-1600 laptop-size sticks (SO-DIMM).
- Slots
- 1 SO-DIMM slot
- Type
- DDR3-1600 204-pin SO-DIMM
- Most seen working
- 8 GB in two or more machines
- Firmware says
- 8 GB maximum
- How sure
- 3 of 3 reports show this layout
See 8 GB DDR3-1600 SO-DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 3 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 Lenovo ThinkPad T431s?
Yes. One slot, up to 8 GB seen working. It takes DDR3-1600 laptop-size sticks (SO-DIMM).
What type of RAM does the Lenovo ThinkPad T431s use?
DDR3-1600 laptop-size sticks (SO-DIMM, 204-pin).
How much RAM can the Lenovo ThinkPad T431s take?
Machines in the reports run up to 8 GB. That matches the 8 GB maximum the firmware reports.
Is this my laptop?
Check the label on the bottom. It should say ThinkPad T431s, and the type code starts with 20AC. Other type codes share this name: 20AA.