Dell OptiPlex 755 - Manual (Page 146)

b. Connect the network cable to the integrated network connector on the back panel of the computer.
PCI Express and DVI Cards
Your computer supports one low-profile PCI Express x16 card.
If you are replacing a PCI Express card with a different type of PCI Express card, remove the current driver for the card from the operating system. See the
documentation that came with the card for information.
Installing a PCI Express x16 Card or DVI Card
1. Follow the procedures in Before You Begin .
2. Remove the computer cover (see Removing the Computer Cover ).
3. Gently lift the release tab on the card retention latch from the inside and pivot the latch open.
4. If you are installing a new PCI Express x16 card or DVI card, remove the filler bracket to create a card- slot opening. Then continue with step 5 .
5. If you are replacing a PCI Express x16 card or DVI card, remove the card (see Removing a PCI Express x16 Card or DVI Card ). If necessary, disconnect
any cables connected to the card. Then continue with step 6 .
6. Prepare the card for installation.
7. Place the card in the connector and press down firmly. Ensure that the card is fully seated in the slot.
NOTE: For PCI card locations, see System Board Components .
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.
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 PCI Express x16 card 2 PCI Express x16 card connector
1 PCI Express x16 DVI-card 2 DVI card connector 3 PCI Express x16 card connector