Simple mathematics
several fillrate tests from 4850 in the wild show ~19500MT/s and clock of the Card (TMUs) is 625Mhz
with 32TMUs and 625mhz you get a theoretical fillrate of 20.000MT/s
with 40TMUs at 625mhz you get 25.000MT/s.
i dont think RV770 is that inefficent.

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