IBM eServer 342 xSeries User Reference Manual page 71

3. Touch the static-protective package containing the DIMM to any unpainted metal
surface on the server. Then, remove the DIMM from the package. You must
install memory in matched pairs: the first pair must be in slots 1 and 4 and the
second pair must be in slots 2 and 3.
Attention: To avoid breaking the retaining clips or damaging the DIMM
connectors, handle the clips gently.
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Chapter 5. Installing Options