Dell Alienware Alpha (Late 2014) - Manual (Page 49)

2 Slide the memory module into the memory-module slot and press the
memory module down until it clicks into place.
NOTE: If you do not hear the click, remove the memory module and
reinstall it.
1 memory module 2 notch
3 tab 4 memory-module slot
Post-requisites
1 Replace the processor fan .
2 Replace the top cover .
3 Replace the base cover .
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