Dell OptiPlex 790 (Early 2011) - Manual (Page 19)

Installing The Expansion Card
1. Insert the PCIe x4 card into the connector on the system board and press down to
secure it in place.
2. Insert the PCIe card (if any) into the connector on the system board and press down
to secure it in place.
3. Insert the PCIe x1 card (if any) into the connector on the system board and press
down to secure it in place.
4. Insert the PCIe x16 card (if any) into the connector on the system board and press
down to secure it in place.
5. Install the cover .
6. Follow the procedures in After Working Inside Your Computer .
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