Dell OptiPlex GX280 - Manual (Page 265)

1 release tab 4 card-edge connector
2 card retention lever 5 card connector
3 card
7. Insert the card firmly into the card connector on the riser board.
8. Lower the card retention lever and press it into place, securing the card(s) in the computer.
9. Replace the card cage:
a. Align the tabs in the side of the card cage with the slots on the side of the computer, and slide the card cage
down into place.
b. Ensure that the riser boards are fully seated in the connectors on the system board.