Dell OptiPlex 390 (Mid 2011) - Manual (Page 17)

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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