Lenovo ThinkPad P51s
Check before you buy.
Every machine in the reports has exactly 16 GB. Some laptops report soldered memory as a slot, so we can't confirm a free slot on this one. Open the bottom panel or check the maker's manual first.
- Slots listed
- 2 SO-DIMM slots
- Type
- DDR4-2133 260-pin SO-DIMM
- Most seen working
- 16 GB in two or more machines
- Firmware says
- 32 GB maximum (often wrong, so we show what machines run)
- How sure
- 6 of 6 reports show this layout
Worked out from 6 hardware reports of this laptop. Sources and method. Updated 9 Nov 2026.
Questions
Can I upgrade the RAM in the Lenovo ThinkPad P51s?
Check before you buy. Every machine in the reports has exactly 16 GB. Some laptops report soldered memory as a slot, so we can't confirm a free slot on this one. Open the bottom panel or check the maker's manual first.
What type of RAM does the Lenovo ThinkPad P51s use?
DDR4-2133 laptop-size sticks (SO-DIMM, 260-pin).
How much RAM can the Lenovo ThinkPad P51s take?
Machines in the reports run up to 16 GB. The firmware reports a maximum of 32 GB, a figure that is often wrong.
Is this my laptop?
Check the label on the bottom. It should say ThinkPad P51s, and the type code starts with 20HB. Other type codes share this name: 20HC.