Lenovo ThinkPad X1 Carbon 4th
Type 20FR 2-in-1 laptop, from 2020 2 hardware reports
Memory
Up to 4 GB
1 laptop-size slot
SSD and charger
Coming next
Checked from separate sources
Only 2 machines reported so far, so this answer rests on few examples. Check the label or open the panel before you buy.
Upgradable
Yes. One slot, up to 4 GB seen working.
It takes LPDDR3-1866 laptop-size sticks (SO-DIMM).
- Slots
- 1 SO-DIMM slot
- Type
- LPDDR3-1866 SO-DIMM
- Most seen working
- 4 GB in two or more machines
- Firmware says
- 20 GB maximum (often wrong, so we show what machines run)
- How sure
- 2 of 2 reports show this layout
See 4 GB LPDDR3-1866 SO-DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 2 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 X1 Carbon 4th?
Yes. One slot, up to 4 GB seen working. It takes LPDDR3-1866 laptop-size sticks (SO-DIMM).
What type of RAM does the Lenovo ThinkPad X1 Carbon 4th use?
LPDDR3-1866 laptop-size sticks (SO-DIMM).
How much RAM can the Lenovo ThinkPad X1 Carbon 4th take?
Machines in the reports run up to 4 GB. The firmware reports a maximum of 20 GB, a figure that is often wrong.