For access, remove this FRU in order:
Note: If the computer you are servicing has two DIMM slots and only one DIMM is used, the card must be installed in SLOT-0 ([a]), but not in SLOT-1 ([b]). Some models only have one DIMM slot.
When installing: Insert the notched end of the DIMM into the socket. Press the DIMM firmly, and pivot it until it snaps into the place. Make sure that it is firmly fixed in the slot and does not move easily.