Dell Precision T5400 (Late 2007) - Manual (Page 194)

194 Adding and Replacing Parts
Desktop Mode: Slots 2-4 support full-length cards (1 PCI Express x16 slot,
one PCI Express x8 slot, and one PCI slot), and slots 1, 5, and 6 support half-
length cards (2 PCI-X slots, and 1 PCI Express x8 slot).
Tower Mode: Slots 2-5 support full-length cards (1 PCI-X slot, one PCI
Express x8 slot, 1 PCI Express x16 slot, and one PCI slot), and slots 1 and 6
support half-length cards (1 PCI-X slot and 1 PCI Express x8 slot).
If you are installing or replacing a PCI, PCI Express, or PCI-X card, see
"Installing an Expansion Card" on page 194. If you are removing but not
replacing a PCI, PCI Express, or PCI-X card, see "Removing an Expansion Card"
on page 201.
Before installing a card, see the documentation that came with the card for
information on configuring the card, making internal connections, or
otherwise customizing it for your computer. If you are replacing a card,
uninstall the existing driver for the card.
Installing an Expansion Card
1 Follow the procedures in "Before You Begin" on page 151.
2 Remove the computer cover (see "Removing the Computer Cover" on
page 153).
3 Rotate the hard-drive carrier out of the computer (see "Rotating the Hard
Drive Carrier Out of the Computer" on page 156).
4 Press the release tabs on the card retention door towards each other and
pivot the door open.
Because the door is captive, it will remain in the open position.