Sapphire Radeon X1800XT 512MB
 

Your graphic card will never be the bottleneck again with Sapphire's top-of-the-line X1800XT. Using the same R520 GPU as the X1800XL, the Sapphire Radeon X1800XT has a core speed of 625Mhz, which is 25% faster than X1800XL. In addition, the ultra fast 1.2ns GDDR3 boost the memory speed to 1.5Ghz, which is 50% faster than X1800XL! We manage to achieve 15-25% improvement over the X1800XL in most of our benchmarks. This is the most significant in more demanding benchmarks at high resolution and FSAA.

Re: Sapphire Radeon X1800XT 512MB
 

X1900XTX is easily the bottle neck in current games when you us maximum quality and higher resolutions.

I doubt a previous generation will fair better:)