One of the greatest things about fabrication processes is that they can be shrunk. Assuming that your architecture is forward-thinking enough, and it navigates issues with power plane-mapping and transistor leakage and all that, you can take your design, make it smaller, run it faster, and use less power. ATI has reaped great successes going from 65nm to 55nm, and NVIDIA is going the same way with their G92 parts. This process will take their 8800 GT, an excellent performer at the time of its release, rename it 9800 GT, and reap away. I mean, that would be the way to do it if you wanted to make any sense whatsoever. Because this is a regular ol' 65nm part.