6900 series are more easy to program with thats because an 5870 shader do have 2 kind of programm units internaly 1 big and 4 smal means 5D-VLIW the 6900 do have 4 of the same big VLIW units per shader groub unit. and the 4 big ones are the same like the big one of the 5 in the 5850 means they just need to drop the smal SIMD-VLIW shader code and only use the big one 4 times per groub.
the 6900 is not really a new architecture its a dropdown of the more hard to program with smal SIMD units and the big SIMD-VLIW units are much more easy to use because an dev do not need to handle with the limitations of the smal ones.


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