Dell XPS 730 (Late 2008) - Manual (Page 43)

Replacing a PCI/PCI Express Card 41
19 Rotate the graphics card bridge back into its original position; push its tip
so that its tab clicks into place.
20 If present, lower the graphics card bridge that lays over the installed cards
and snap it into place.
21 Replace the computer cover (see "Replacing the Computer Cover" on
page 17), reconnect the computer and devices to electrical outlets, and
then turn them on.
22 Install any drivers required for the card as described in the card
documentation.