IBM eServer 232 xSeries Installation Manual page 24

5. Make sure the retaining clips are in the closed position.
6. If you have other options to install, install them now.
7. Install the cover.
8. Continue with "Cabling the server" on page 19.
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IBM xSeries 232: Installation Guide
b. Position the DIMM so that it aligns correctly with the connector.
Note: The DIMM is "keyed" for proper insertion.
c. Insert the DIMM into the connector by pressing one edge of the DIMM and
then the other edge of the DIMM.
d. Make sure the retaining clips are in the closed position. If a gap exists
between the DIMM and the retaining clips, the DIMM has not been properly
installed. In this case, open the retaining clips and remove the DIMM; then,
reinsert the DIMM.
e. Repeat steps 4a through 4d for the second DIMM; then continue with step 5.
DIMM 3
DIMM 2
DIMM 4
DIMM 1