Lenovo ThinkPad P51 W10DG
Yes. 4 slots, up to 48 GB seen working.
It takes DDR4-2400 laptop-size sticks (SO-DIMM).
- Slots
- 4 SO-DIMM slots
- Type
- DDR4-2400 260-pin SO-DIMM
- Most seen working
- 48 GB in two or more machines
- Firmware says
- 64 GB maximum (often wrong, so we show what machines run)
- How sure
- 4 of 4 reports show this layout
Worked out from 4 hardware reports of this laptop. Sources and method. Updated 9 Nov 2026.
Batteries in these laptops report 90 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 4 battery readings. Sources and method. Updated 9 Nov 2026.
IllustrationQuestions
Can I upgrade the RAM in the Lenovo ThinkPad P51 W10DG?
Yes. 4 slots, up to 48 GB seen working. It takes DDR4-2400 laptop-size sticks (SO-DIMM).
What type of RAM does the Lenovo ThinkPad P51 W10DG use?
DDR4-2400 laptop-size sticks (SO-DIMM, 260-pin).
How much RAM can the Lenovo ThinkPad P51 W10DG take?
Machines in the reports run up to 48 GB. The firmware reports a maximum of 64 GB, a figure that is often wrong.
What battery does the Lenovo ThinkPad P51 W10DG use?
Batteries in these laptops report 90 Wh, going by 4 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 P51 W10DG, and the type code starts with 20MN.