Dell XPS 8500 (Early 2012) - Manual (Page 44)

2
1
Removing the PCI-Express x1 Card(s)
1 Remove the screw that secures the card-retention bracket.
2 Lift the card-retention bracket and set it aside in a secure location.
1 screw 2 card-retention bracket
PCI-Express x1 Card(s) 44