Dell Dimension E521 - Manual (Page 18)

l One PCI Express x1 card slot (SLOT2
l Two PCI card slots (SLOT3, SLOT4)
See System Board Components for card slot location.
PCI Cards
Your computer supports two PCI cards.
If you are installing or replacing a card, follow the procedures in the next section. If you are removing but not replacing a PCI card, see Removing a PCI Card .
If you are replacing a card, remove the current driver for the card from the operating system.
If you are installing or replacing a PCI Express card, see Installing a PCI Express Card .
Installing a PCI Card
1. Follow the procedures in Before You Begin .
2. Remove the computer cover (see Removing the Computer Cover ).
3. Gently push the release tab on the card retention door from the inside to pivot the door open. The door is hinged and will remain in the open position.
4. If you are installing a new card, remove the filler bracket to create a card-slot opening. Then continue with step 6 .
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. Grasp the card by its top corners, and ease it out of its connector.
6. Prepare the card for installation.
See the documentation that came with the card for information on configuring the card, making internal connections, or otherwise customizing it for your
computer.
7. Place the card in the connector and press down firmly. Ensure that the card is fully seated in the slot.
1 release tab 2 card retention door
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.