With enabled anisotropic filtering the graphics processor is loaded much heavier, while the memory bus workload remains almost the same. So, graphics core overclocking is essential particularly for anisotropic filtering. Take a look at the results:
In the hardest mode in the highest resolutions the gap between overclocked graphics cards and the solutions working at the nominal frequencies gets somewhat smaller. It is probably the memory bus workload that starts telling here, especially keeping in mind that memory overclocking was not very efficient.
So, in Quake3 Arena the overclocked NVIDIA GeForce FX 5900 and ARI RADEON 9800 proved faster than their more powerful counterparts. They managed to outpace their non-overclocked Ultra and Pro fellows by the same value as their fellows outpaced them before we sat to overclocking.
Now let’s see how the situation will change in a heavier test: the “gaming” Unreal Tournament 2003 demo record:
Overclocking: Unreal Tournament 2003
In the lightest modes our overclocked graphics cards outperform NVIDIA GeForce FX 5900 Ultra and ATI RADEON 9800 Pro working at the nominal frequencies. However, the performance difference between them is not so great as in Quake3 Arena.