Not to the same extent. The r5xx family was the first to have the Avivo display pipe (significantly different programming from 4xx, no TV-out functionality in the overlay etc..) and it introduced a new fragment shader instruction set.
There are differences between 6xx/7xx but they are smaller by comparison. We also implemented support for the two generations at the same time and mostly in the same code, which makes their level of support more likely to track.



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