Well a good test would be doom 3 or half life 2. Either of these have great graphics that would push your video card to the limit (yes both are about 2 years old now, but no graphics cards could handle either one with all settings enabled at 1600x1200). Or if you wait till July 10 a new game called Prey will come out and should give your video card even more of a workout.
I have a ATI-RADEON X1300 PRO Graphics Card. It supports Up to 2048 x 1536
3d resolution, with 32 bit color. 600 million polygons per second. 256 mb video memory. 400MHz clock speed of video memory.Supports Shader Model 3.0 for improved image quality. http://www.bestbuy.com/site/olspage....=1130987912270