Texture Filtering Image Quality - 8X, 16X
8X anisotropic filtering

FilterTest - Quality - 8X Aniso - Click for full size .png (~1MB)

FilterTest - Performance - 8X Aniso - Click for full size .png (~1MB)

Serious Sam - Quality - 8X Aniso - Click for full size .png (~2.37MB)

Serious Sam - Performance - 8X Aniso - Click for full size .png (~2.37MB)

Serious Sam - Comparison - 8X Aniso
16X anisotropic filtering

FilterTest - Quality - 16X Aniso - Click for full size .png (~1MB)

FilterTest - Performance - 16X Aniso - Click for full size .png (~1MB)

Serious Sam - Quality - 16X Aniso - Click for full size .png (~2.37MB)

Serious Sam - Performance - 16X Aniso - Click for full size .png (~2.37MB)

Serious Sam - Comparison - 16X Aniso
The 16X filtering mode is new to NVIDIA hardware with NV40. FilterTest shows it quite nicely with a smoother blend pattern on the inner sections of the image, between the first and second texture stages.