Dell Precision T7400 (Late 2007) - Manual (Page 218)

218 Adding and Replacing Parts
5 If you are replacing a card, see "Removing a PCI Express Graphics Card
from an SLI Configuration" on page 208.
6 Prepare the card for installation.
See the documentation that came with the card for information on
configuring the card, making internal connections, or otherwise
customizing it for your computer.
7 If the card is full-length, align it between the plastic card guides on the
card fan.
8 Position the card so that it is aligned with the slot and the securing tab (if
present) is aligned with the securing slot.
1 release tab 2 card retainer
1
2