Lenovo ThinkCentre Edge 91, Hardware Maintenance Manual, Page: 122 / 262

7. To complete the installation or replacement, go to “Completing the parts replacement” on page 141
Installing or replacing a memory module
Attention:
Do not open your computer or attempt any repair before reading and understanding the “Important safety information”
in the
ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy of the ThinkCentre
Safety and Warranty Guide , go to:
http://www.lenovo.com/support
This section provides instructions on how to install or replace a memory module.
Your computer has four slots for installing or replacing DDR3 UDIMMs that provide up to a maximum of 16
GB system memory. When installing or replacing a memory module, use the following guidelines:
• Use 1 GB, 2 GB, or 4 GB DDR3 UDIMMs in any combination up to a maximum of 16 GB.
• Please refer to below table for detail memory modules installation sequence.
UDIMM DIMM 1 DIMM 2 DIMM 3 DIMM 4
One UDIMM
X
Two UDIMMs X, 1 X, 2
Three UDIMMs X, 1 X, 2 X, 3
Four UDIMMs X, 1 X, 2 X, 3 X, 4
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 79.
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 77.
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 46. Removing a memory module
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ThinkCentre Hardware Maintenance Manual