Lenovo ThinkStation D20 - Manual (Page 31)

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, go to:
http://support.lenovo.com
CAUTION:
The memory modules might be very hot. Turn off the computer and wait three to five minutes to let
the computer cool before removing the computer cover.
Your computer has 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).
When installing or replacing memory modules, use the following guidelines:
• Use either DDR3 ECC UDIMMs or DDR3 ECC RDIMMs for your computer. Do not install both the
UDIMMs and RDIMMs into the same computer.
• Use 1 GB, 2 GB, or 4 GB UDIMMs in any combination up to a maximum of 48 GB.
• Use 1 GB, 2 GB, 4 GB, or 8 GB RDIMMs in any combination up to a maximum of 96 GB.
• Always install DIMMs in the numerical order printed on the system board (DIMM1, DIMM2, DIMM3, and
so on). Install memory modules into the blue color memory slots first.
• If your computer has only one CPU installed, be sure to install memory modules only in the memory
slots adjacent to that CPU.
• If your computer has two CPUs installed, install equal numbers of memory modules in both sets of CPU
DIMM slots for maximum performance.
To install or replace a memory module:
1. Remove the computer cover. See “Removing the computer cover” on page 11.
2. Lay the computer on its side.
3. Locate the memory slots. See “Identifying parts on the system board” on page 8.
4. For some computer models, you might need to remove the memory fan duct to access the memory
slots. To remove the memory fan duct, disconnect the memory fan cable from the system board,
remove the blue shipping clip, press inward on the two tabs, pivot the fan duct, and then disengage the
other end of the duct.
Note: Not all computer models have the memory fan duct and blue shipping clip.
Figure 24. Removing the memory fan duct
Chapter 3 . Installing options and replacing hardware 25