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UDIMM DIMM 1 DIMM 2 DIMM 3 DIMM 4
One UDIMM X
Two UDIMMs X, 1 X, 2
Three UDIMMs X, 3 X, 1 X, 2
Four UDIMMs X, 3 X, 1 X, 4 X, 2
To install or replace a memory module, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Lay the computer on its side for easier access to the system board.
4. Locate the memory slots. See “Locating parts on the system board” on page 71.
5. Remove any parts that might prevent your access to the memory slots. Depending on your computer
model, you might need to remove the PCI Express x16 graphics card for easier access to the memory
slots. See “Installing or replacing a PCI card” on page 82.
6. Depending on whether you are installing or replacing a memory module, do one of the following:
• If you are replacing an old memory module, open the retaining clips and gently pull the memory
module out of the memory slot.
Figure 16. Removing a memory module
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ThinkCentre M78 Hardware Maintenance Manual