Dell OptiPlex 745 - Manual (Page 28)

5. If you are replacing a card that is already installed in the computer, remove the card. If necessary, disconnect any cables connected to the card.
6. Prepare the card for installation.
7. If you are installing a PCI Express card, press the lever on the securing tab away from the card connector as you insert the new card.
8. Place the card in the connector and press down firmly. Ensure that the card is fully seated in the slot.
1 PCI Express x16 card
2 lever
3 securing slot (not all cards)
4 securing tab
5 PCI Express x16 card connector
NOTE: See the documentation that came with the card for information on configuring the card, making internal connections, or customizing it for your
computer.
1 card-retention latch
2 release tab
3 card
4 card-edge connector
5 card connector
CAUTION: Some network adapters automatically start the computer when they are connected to a network. To guard against electrical shock, be
sure to unplug your computer from its electrical outlet before installing any cards.