Lenovo ThinkCentre M90 3244 User Manual page 25

This section provides instructions on how to install or replace a memory module.
Your computer has four slots for installing or replacing DDR3 DIMMs that provide
up to a maximum of 16 GB system memory. When installing or replacing a
memory module, use the following guidelines:
v Use 1 GB, 2 GB, or 4 GB DDR3 DIMMs in any combination up to a maximum of
16 GB.
v Install memory modules in the sequence of DIMM 1, DIMM 3, DIMM 2, and
DIMM 4. See "Locating parts on the system board" on page 11.
To install or replace a memory module, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See "Opening the computer cover" on page 14.
3. Pivot the optical drive bay assembly upward to gain access to the memory
slots. See "Accessing the system board components and drives" on page 16.
4. Locate the memory slots. See "Locating parts on the system board" on page 11.
5. Remove any parts that might prevent access to the memory slots.
6. Open the retaining clips.
Figure 8. Opening the retaining clips
If you are replacing an old memory module, open the retaining clips and
gently pull the memory module out of the memory slot.
Figure 9. Removing a memory module
Chapter 2. Installing or replacing hardware
17