Dell XPS 8500 Owner's Manual page 29

1 Align the notch on the bottom of the memory module with the tab on the
memory-module connector.
1 memory module
3 tab
CAUTION:
To avoid damage to the memory module, press the memory module
straight down into the connector while you apply equal force to each end of the
memory module.
2 Insert the memory module into the memory-module connector until the
memory module snaps into position and the securing clip locks in place.
1 securing clip (snapped in position)
1
2
3
2 notch
4 cutouts (2)
1
4
Memory Module(s)
29