Dell Alienware M14x R2 (Early 2012) - Manual (Page 29)

4 Slide the memory module out of the memory-module connector.
3
1
1 memory-module connector 2 securing clips (2)
3 memory module
Replacing the Memory Module(s)
Procedure
NOTE: If you need to install memory modules in both memory-module connectors,
install a memory module in the lower connector before you install a memory module
in the upper connector.
1 Align the notch in the memory module with the tab in the memory-
module connector.
Memory Module(s) 31