Lenovo ThinkPad P15 Gen 2 User Manual page 53

Important notice about memory module installation
Your computer comes with four memory module slots, and supports up to 128 GB memory module in total.
a b
Slot and slot are under the bottom door, and slot
or replacing a memory module, use the following guidelines for better performance:
Important: It is recommended that you follow below installation rules. Otherwise, the computer might either
not start or not perform well.
• To install one or two memory modules in total, install it/them in the slots under the bottom cover. Do not
install it/them in the slots under the keyboard.
• To install three or four memory modules in total, install two memory modules in the slots under the bottom
cover first. Then install the third and fourth memory modules in the slots under the keyboard.
• Your computer supports up to 128 GB memory module in total, and it is recommended that you use
memory modules with the same capacity and speed for best dual-channel memory performance.
• Replace only with a memory module of the type recommended by Lenovo.
Memory module under the bottom door
For access, do the following:
1. Disable the built-in battery. See "Disable Fast Startup and the built-in battery" on page 37.
2. Turn off the computer and disconnect the computer from ac power and all connected cables.
3. Close the computer display and turn the computer over.
4. Remove the bottom door. See "Bottom door" on page 38.
c d
and slot are under the keyboard. When installing
.
Chapter 6 CRU replacement
47