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A few benchmarks follow that show how much performance can be gained from a brilinear optimization.
You have to remember that with colored mipmaps, there are still some places that are not colored. ATI driver still optimizes those textures. This means that the delta between full filtering and optimized filtering of the X800 must be even greater than the results with colored mipmaps show.
ATI apologizes for the failure to explain this by saying that an application has been filed for patent protection of the adaptive technology, and they thus cannot discuss it. However, there is no way of checking how much truth there is to this.
It is more significant that in its white papers, ATI leaves one with the impression that full trilinear filtering is being offered, and calls on reviewers to switch off competitors' trilinear filtering - read GeForce 6800 - to ensure a "fairer" comparison. At the same time, they are called on to assess the image quality of the X800 by means of tests with colored mipmaps - but at that precise moment the driver provides a filter quality that is not offered in games.