They perform optimizations without changing image quality, same way its done to make games run faster and look the same.
It seems ATI was ready for it first, theirs already ran that fast.
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FX5900 - 3DMark2001 [20,566] - 3DMark2003 [7,281] - Aquamark3 [56,694]
Ti4400 - 3DMark2001 [16,028]
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