FUD Zilla says the upcoming ATI R700 GPU will be a multi-core device that uses four or more small cores:
This is why R680, Radeon 3870 X2 is extremely important for ATI’s future, as it looks like that the future is really multicore. We still don’t know if G100 uses the same approach, but we would not be surprised.
R700XT, the high-end version of the chip will use four or more smaller cores to reach the performance crown and, in this case, you need an excellent Crossfire, multichip driver.
R680 is actually a warm-up product, as ATI will test the Crossfire X with two, three and four cores, and this will give them predictions about the future.