Dell XPS 8500 (Early 2012) - Manual (Page 29)

1 Align the notch on the bottom of the memory module with the tab on the
memory-module connector.
1
2
4
3
1 memory module 2 notch
3 tab 4 cutouts (2)
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)
Memory Module(s) 29
1