Dell Precision T7400 (Late 2007) - Manual (Page 225)

Adding and Replacing Parts 225
Replacing the Optional Graphics Riser Card
NOTE: To upgrade to or downgrade from a dual-graphics configuration (with the
graphics riser card), you will need additional parts that can be ordered from Dell.
See "Contacting Dell" on page 287.
Follow the steps for graphics riser card removal in reverse order.
Drives
Your computer supports:
1 screws 2 graphics riser card
1
2