Dell XPS 730 (Late 2008) - Manual (Page 36)

34 Replacing a PCI/PCI Express Card
11 If present, lower the graphics card bridge that lays over the installed cards
and snap it into place.
12 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.
1 graphics card bridge 2 power connectors (2)
3 dual-PCIe graphics cards
1
3
2