Dell XPS 15Z (L511Z, Mid 2011) - Manual (Page 20)

20 Memory Module(s)
5 Remove the memory module from the memory-module connector.
Replacing the Memory Module(s)
CAUTION: If you need to install memory modules in two connectors, install a
memory module in the connector labeled "DIMM A" before you install a memory
module in the connector labeled "DIMM B".
1 Follow the instructions in "Before You Begin" on page 9.
2 Align the notch in the memory module with the tab in the
memory-module connector.
1 memory-module connector 2 securing clips (2)
3 memory module
3
2
1
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