Futuremark 3DMark06 build 120
The higher clock rates of the Sapphire Toxic X1900 XTX make it competitive against the GeForce 7900 GTX. Well, the standard Radeon X1900 XTX is a mere 142 points behind the Nvidia card, too. The overall 3DMark06 score is the sum of SM2.0 and SM3.0/HDR tests, so let’s check them out independently.
The Sapphire Toxic X1900 XTX has worse results in the SM2.0 tests in comparison with the GeForce 7900 GTX, but this is a consequence of the test’s demanding high texturing speed from the card. Note the big difference between the Radeon X1900 XTX and Radeon X1900 XT: each megahertz is highly important in 3DMark06. The 48 pixel processors on board Radeon X1900 hardly matters here – the Radeon X1800 XT is just a little slower than the Radeon X1900 XT.
It’s different in the SM3.0/HDR tests: the Sapphire Toxic X1900 XTX and the Radeon X1900 XTX have no rivals at all. The R580-based solutions show their best, mainly due to their 48 pixel processors which are not idle here as they were in the SM2.0 tests. This fact is indicated by the big difference between the results of the Radeon X1900 XT and the Radeon X1800 XT.
As we said above, the first SM2.0 test is the only of 3DMark06’s tests that requires a high fill rate and does not contain complex pixel shaders. This helps the GeForce 7900 GTX win two resolutions out of three, but the efficient ring-bus memory controller of the Sapphire Toxic X1900 XTX says its word in 1600x1200 where the memory load is exceedingly high.
The second SM2.0 graphics test is nothing else but an improved second game test from 3DMark05 and it is far less sensitive to the scene fill rate. The Sapphire Toxic X1900 XTX and Radeon X1900 XTX leave the GeForce 7900 GTX far behind here in all the resolutions. It’s only in 1024x768 with enabled full-screen antialiasing and anisotropic filtering that Nvidia’s card can match the Radeon XT1900 XT.
The results of the SM2.0 graphics tests show that the senior model of the GeForce 7 family only wins the first test which is sensitive to the scene fill rate and, accordingly, to the number of TMUs. Moreover, you should remember that the Radeon X1900 family feels better in FSAA modes due to their very effective memory controller, so the results of the separate SM2.0 tests somewhat contradict the overall scores we got in the “pure speed” mode.