Lenovo ThinkStation S20 4157 Hardware Manual page 109

CAUTION:
The memory module might be very hot. Turn off the computer and wait three to
five minutes to let the computer cool before opening the computer cover.
This section provides instructions on how to replace a memory module.
Your computer has 6 slots for installing or replacing DDR3 UDIMMs (double data
rate 3 error correction code unbuffered dual inline memory modules).
When installing or replacing memory modules, use the following guidelines:
v Always install DIMMs in the numerical order printed on the system board
(DIMM1, DIMM2, DIMM3, and so on).
v Install memory modules into the blue memory slots first. Install memory
modules into the black memory slots only after all the blue memory slots are
occupied.
v Be sure to install memory modules starting with the memory slots adjacent to
the CPU.
To remove or replace the memory module, do the following:
1. Remove the computer cover. See "Removing the cover" on page 96.
2. Locate the memory module slots. See "Locating parts on the system board" on
page 98.
3. Remove the memory module being replaced by opening the retaining clips.
4. Position the replacement memory module over the memory slot. Make sure the
notch 1 on the memory module aligns correctly with the slot key 2 on the
system board. Push the memory module straight down into the slot until the
retaining clips close. See "Installing or replacing a memory module" on page
141.
Chapter 10. Replacing FRUs - Menorca Computers
103