Use free tools to see how well your hardware performs. In this test I run Furmark at 800x600 on a 7900GT with a P4 processor.
Furmark
http://www.geeks3d.com/20090703/furma...
GPU-Z
http://www.techpowerup.com/gpuz/
San Diego Computer Repair and Consulting
http://www.gaslampcomputers.com/blog