Dell Inspiron 660 Owner's Manual page 36

PCI Express x16 card — Push the securing tab to the side and place the
PCI Express card in the slot on the system board and press down firmly.
Ensure that the PCI Express card is fully seated in the slot.
1 securing tab
3 PCI Express x16 card
Postrequisites
1 Replace the card retention bracket. See "Replacing the Card Retention
Bracket" on page 31.
2 Connect any cables that should be attached to the card.
See the documentation that shipped with the card for information about
the card's cable connections.
CAUTION:
the cards can prevent the computer cover from closing properly or cause damage
to the equipment.
3 Replace the computer cover. See "Replacing the Computer Cover" on
page 19.
4 Follow the instructions in "After Working Inside Your Computer" on
page 11.
5 To complete the installation, see "Configuring Your Computer After
Removing or Installing the PCI Express Card" on page 37.
36
PCI Express Cards
1
Do not route card cables over or behind the cards. Cables routed over
3
2 PCI Express x16 card slot
2