Anisotropic Filtering
We'll begin with the results from D3DAFTester v13a (by Demirug).
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When anisotropic filtering is selected through the applications, there is no discernible difference between the texture stages 0 and 1 on both cards. However, when filtering is forced through the driver menus, there are obvious differences. Although the NVIDIA drivers go a step back in Aniso levels, the driver continues to use a trilinear filter. ATi, on the other hand, switches to full bilinear only filtering when texture stage 1 is selected.
