Futuremark 3DMark06 build 120
The specifications of Radeon X1900 XTX and PowerColor X1900 XT are not very much different from one another, however even this slight difference matters a lot for the results in 3DMark06 and the performance difference between these two solutions makes 806 points. As a result, our today’s hero outperforms only Radeon X1800 XT and GeForce 7900 GT yielding to all other testing participants when working at nominal frequencies. Overclocking definitely improves its results letting it almost catch up with GeForce 7900 GTX.
Since the total 3DMark06 score comes from the scores of SM2.0 and SM3.0/HDR tests, it makes sense to look at these tests separately.
Even PowerColor X1900 XT working at higher frequencies falls far behind GeForce 7900 GTX in SM2.0 tests, because these tests do not care about efficient 3.0 shader performance. The texturing speed is on the contrary, very important at least in the first test.
In SM3.0/HDR tests the graphics accelerator needs to have not only high fillrate but also maximum performance during pixel shader 3.0 processing, efficient HDR support and dynamic shadows created with Cascaded Shadow Maps. Although PowerColor X1900 XT working at the nominal speed still yields to GeForce 7900 GTX, the increase of the chip clock speed by 50MHz has terrific effect on the performance. So the overclocked PowerColor X1900 XT outperforms not only the Nvidia solution, but also Radeon X1900 XTX.
As usual, GeForce 7900 GTX is ahead in lower resolutions. However in 1600x1200 the less efficient memory controller of the Nvidia products plays a bad role for them. In this case PowerColor X1900 XT is only 0.4fos behind Nvidia’s flagman.
The second SM2.0 test doesn’t require high fillrate like the first test, therefore PowerColor X1900 XT is not any slower than GeForce 7900 GTX in 1024x768. And in higher resolutions it becomes an indisputable leader leaving Nvidia’s fastest cards 10%-15% behind.
This way it is the PowerColor X1900 XT results of the first test that determined the situation we see on the total score chart, while in the second test our hero feels quite confident. Besides, some results were obtained in eye candy mode, and these conditions are more favorable for Radeon X1900 with its ring bus memory controller. GeForce 7900 GTX equipped with a traditional controller is less efficient with higher memory workload when FSAA and anisotropic filtering are enabled.