Installing Or Replacing A Memory Module - Lenovo ThinkCentre M79 Hardware Maintenance Manual

5. To lower the drive bay assembly, slightly press the drive bay assembly clip
bay assembly downward as shown.
Figure 14. Lowering the drive bay assembly

Installing or replacing a memory module

Attention: Do not open your computer or attempt any repair before reading and understanding the Chapter
1 "Read this first: Important safety information" on page 1.
Your computer has four slots for installing or replacing DDR3 UDIMMs that provide up to a maximum of
32 GB system memory. When installing or replacing a memory module, use 2 GB, 4 GB, or 8 GB DDR3
UDIMMs in any combination up to a maximum of 32 GB.
The following table provides information about the memory module installation rules that you should
consider when installing or removing a memory module. The "X" mark indicates the memory slot(s) into
which the memory module(s) should be installed in different situations. The numbers 1, 2, 3, and 4 indicate
the installation sequence. To locate the memory module slots, see "Locating parts on the system board"
on page 34.
UDIMM
One UDIMM
Two UDIMMs
Three UDIMMs
Four UDIMMs
To install or replace a memory module, do the following:
1. Remove any media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover. See "Removing the computer cover" on page 105.
3. Lay the computer on its side for easier access to the system board.
4. Remove the heat sink fan duct. See "Replacing the heat sink and fan assembly" on page 126.
DIMM 1 DIMM 2
X
X, 1
X, 1
X, 1
DIMM 3
X, 2
X, 3 X, 2
X, 3 X, 2
.
Chapter 11
1 inward and pivot the drive
DIMM 4
X, 4
Installing or replacing hardware
109