Last rumor was HD6900 would have 20% more shaders than HD5800 (~1920 for 6970, ~1730 for 6950). Add in more uArch improvements and 50% more VRAM and I'd think that 25-30% faster is feasible if nothing else.
I'd say more like 10%. Look at the difference between the 5850 and 5870. 1440 vs 1600 SPU's and 100Mhz difference between the two and a measly ~5% performance edge over the 5850.
I'm thinking this Cayman might just match the GTX480.
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