This 3D experience gives you the step by step process of replacing the Graphics card and a OptiPlex SFF 7020. The procedure will also include removing the Side Cover, Expansion card and reinstalling them.
Removal
Side Cover
Identify the side cover highlighted in blue.
Loosen the captive screws that secure the side cover to the chassis.
Slide and lift the side cover off the chassis.
Expansion card
Install
Expansion card
Side Cover
Identify the side cover location highlighted in blue.
Slide the side cover towards the front of the computer.
Tighten the captive screws that secure the side cover to the chassis.