Also, in the BIOS:
"Various manufacturers use different types of software to handle system BIOS setting options. Consequently, finding the correct menu option for changing onboard video card memory settings may be easier with some models than with others. Nevertheless, the menu option you need to use to change the graphics adapter memory settings should be in "Advanced," "Advanced Chipset" "Advanced Features" or other similarly named section of the menu. You can use the arrow keys on the keyboard to navigate to the correct menu option or click the header if the system BIOS supports use of a mouse."
should be set to the following:
RAM > Recommended Video Memory
2GB > 256MB
4GB > 512MB
8GB or more > 1024MB or more
If at first you don't succeed; call it version 1.0