Lenovo ThinkPad X1 Extreme
Yes. 2 slots, up to 64 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
- 64 GB in two or more machines
- Firmware says
- 64 GB maximum
- How sure
- 39 of 39 reports show this layout
Worked out from 39 hardware reports of this laptop. Sources and method. Updated 9 Nov 2026.
Batteries in these laptops report 80 Wh.
That is the design capacity the batteries themselves report, and the label can read 1 to 3 Wh higher. Other pack sizes may have shipped, so check the capacity printed on yours before you order.
From 39 battery readings. Sources and method. Updated 9 Nov 2026.
IllustrationQuestions
Can I upgrade the RAM in the Lenovo ThinkPad X1 Extreme?
Yes. 2 slots, up to 64 GB seen working. It takes DDR4-2666 laptop-size sticks (SO-DIMM).
What type of RAM does the Lenovo ThinkPad X1 Extreme use?
DDR4-2666 laptop-size sticks (SO-DIMM, 260-pin).
How much RAM can the Lenovo ThinkPad X1 Extreme take?
Machines in the reports run up to 64 GB. That matches the 64 GB maximum the firmware reports.
What battery does the Lenovo ThinkPad X1 Extreme use?
Batteries in these laptops report 80 Wh, going by 39 reports. Other pack sizes may have shipped, so check the capacity printed on yours.
Is this my laptop?
Check the label on the bottom. It should say ThinkPad X1 Extreme, and the type code starts with 20MF. Other type codes share this name: 20MG.