User's Manual

6. To reinstall the PCI card holder into the chassis, insert the two tabs 1 into the
corresponding holes in the chassis, and then pivot the PCI card holder
downward until the front of the card holder snaps into position.
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 ThinkStation Safety
and Warranty Guide that came with your computer. To obtain a copy of the
ThinkStation Safety and Warranty Guide,goto:
http://www.lenovo.com/support
This section provides instructions on how to install or replace a memory module.
Depending on your model, your computer has six or 12 slots for installing or
replacing DDR3 ECC UDIMMs (double data rate 3 error correction code
unbuffered dual in-line memory modules) or DDR3 ECC RDIMMs (double data
rate 3 error correction code registered dual in-line memory modules). See
“Locating parts and connectors on the system board” on page 11.
When installing or replacing memory modules, use the following guidelines:
v Use either DDR3 ECC UDIMMs or DDR3 ECC RDIMMs for your computer. Do
not install both the UDIMMs and RDIMMs into the same computer.
v Use 1 GB, 2 GB, or 4 GB UDIMMs in any combination up to a maximum of 24
GB or 48 GB of system memory.
Figure 9. Installing the PCI card holder
Chapter 2. Installing or replacing hardware 17