Futuremark 3DMark06 build 1.0.2
In 3DMark06 the leadership belongs to Gigabyte 7900 GTX although it is only 142 points ahead of Gigabyte Radeon X1900 XTX. It is probably the first SM2.0 graphics test that determined these results, so let’s take a closer look at it now.
It is true, Gigabyte GeForce 7900 GTX has the biggest advantage in SM2.0 tests, which equals 257 points while the overall score lies around 2000 points. It is most likely to be the first test, a heavier version of Game 1 3DMark05 test, that imposes the biggest influence on the result.
In SM3.0/HDR tests the winner is Gigabyte Radeon X1900 XTX. This solution feels at home in these benchmarks with a lot of complex shader effects and HDR. Although I have to admit that this advantage is not as significant as the advantage of Gigabyte GeForce 7900 GTX in the previous group of benchmarks we have just discussed.
The supposition we made that Gigabyte GeForce 7900 GTX owes its victory to the results of the first SM2.0 graphics test have been proven: the card is 10%-15% ahead of the competitor in the first two resolutions. In 1600x1200 the gap almost vanishes and the reason evidently lies in the more efficient work with the memory subsystem of Gigabyte Radeon X1900 XTX. The nearly identical results of both, Gigabyte Radeon X1900 XTX and GeForce 7900 GTX, indicate that the TMUs limit the performance of our testing participants in 1024x768: we see that none of them can overcome the 17fps performance barrier.
The second SM2.0 test shows a totally different picture: the leadership here belongs to Gigabyte Radeon X1900 XTX and as the resolution grows, its advantage increases going beyond 20% in 1600x1200. Unlike the first test, this benchmark requires high texturing speed and Radeon X1900 XTX has always been great with CSM dynamic shadows (thanks to Fetch4 support).
So, Gigabyte Radeon X1900 XTX it is solely the first test that determined the failure of Gigabyte Radeon X1900 XTX in SM2.0 total score, because the first test is the most sensitive to the number of TMUs (and hence to the fillrate).