I think the problem with 512 at this point is not only yields but additionally power requirements.
I.E. The 512 although using only 6 shaders, will use significanly more power than a 480(just look at the difference between the 470 and 480), additionally to justify the another product it will need higher clocks than the 480 itself, as a 6 percent difference hardly needs a new product.
512 shaders + 750mhz clock with the current process means a card that needs a waterblock and 2 8 pin power.




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