PC Games Hardware had an interview with NVIDIA Chief Scientist Bill Dally, they talked about various subjects including GPU technology, DirectX 11 and Intel's Larrabee. You can read it over here.
PCGH: Another topic: In contrast to your competitor, Nvidia's GPUs, at least the high-end ones, have in the last couple of years always been very large, physically. AMD is going the route of having a medium-sized die and scale it with X2 configurations for high-end needs; Nvidia is producing very large GPUs. Is that a trend which could change in the future or don't you think you have reached the limits of integration in single-chips, the "Big Blocks of Graphics"?
Bill Dally: We're trying to always deliver the best performance and value to our customers and we're gonna continue doing that. And for any given generation there's an economic decision that has to be made about how large to make the die. Our architecture is very scalable, so the larger we make the die, the more performance we deliver. We also deliver duplex-configurations as in GTX 295 and so, if build a very large die and then also put two of them we can deliver even more performance. And so for each generation we're gonna to the calculation side what is the most economic way of delivering the best performance for our customers.