Dell OptiPlex XE4 Tower Service Manual page 41

Steps
1. To remove the PCIe dummy bracket, insert a flat-head screwdriver in the hole of the bracket, push the bracket to release it,
and then lift the bracket out of the system.
2. Lift the pull tab to open the PCIe door.
3. Insert the optional SMA module into its slot on the system board.
Next steps
1. Install the side cover.
2. Follow the procedure in after working inside your computer.
Removing and installing components 41