Dell OptiPlex G1 Reference And Installation Manual page 105

You can upgrade video memory from 2 to 4 MB by installing a video-memory upgrade
module. Upgrading the video memory increases video performance and allows you to
use video modes for application programs that require high resolutions and many
colors.
To upgrade the video memory, follow these steps:
Video memory modules are keyed , or designed to fit in the socket in only one
direction. The socket on the system board is notched so that the video memory
module can be firmly seated only one way.
Align the video memory module's edge connector with the slot in the center of
the socket. Press the video memory module's edge connector firmly into the
socket. Pivot the module down until it clicks into place.
If you do not hear a sharp click, you should remove the module and reinstall it.
securing
clips (2)
Installing System Board Options 6-11