Synthetic Benchmarks
ShaderMark 2.1
ShaderMark 2.1 tests shader rates with some simple shaders on simple geometry. It's a nice test of theoretical performance.
The results show the expected delta between GT and GTX, given their respective configurations. Dropping a pixel quad causes performance to drop by an average of 20%. Given the clock deficit and the ~17% reduction in fragment processing units, the drop is nearly spot on. What's interesting is the GT at XFX's 450/525 clocks which only gives 12% of the performance away. Factor in the price of the GT and, well, we'll save that supposition until the conclusion.
iXBT's Direct3D RightMark 1.0.5.0
Our RightMark test suite shows the GT to give up 15% at reference clocks and less than 10% of performance at XFX's clocks. Our 7800 GTX preview showed that board's performance relative to the top NV40-based SKU. Now you can see the theoretical delta to the top-clocked R480 SKU, which is currently the best ATI have to offer.
