How to Use System RAM As Video RAM
The option to use a portion of your onboard system RAM as video RAM for graphics capabilities is an option enjoyed by older computers, prior to the time when graphics cards came with nearly as much memory as regular RAM. Accomplish this by setting the system aperture size in your computer's BIOS, reserving a portion of your system RAM for graphical usage.
Restart the computer.
Press the key indicated during the startup messages (typically one of the "F" keys) to enter BIOS.
Click "Advanced" and press "Enter."
Highlight "AGP Aperture Size" and press "Enter." Select the desired amount of RAM you wish to use for video purposes and click "Enter."