Tomb Raider: Legend
The GeForce 8800 GTS and GTS 320MB are limited to 1600x1200 whereas the GeForce 8800 Ultra and GTX deliver enough performance for you to play in the higher resolution as well.
You can try to use your GeForce 8600 GTS to play at a resolution of 1280x1024 but occasional slowdowns to below comfortable level are unavoidable. You’ll probably choose to disable FSAA or lower the resolution. The GeForce 8500 GT is only half as fast as the GeForce 8600 GTS and is far from providing an acceptable speed.