Originally posted by: RyanVM
I don't find this too hard to believe and here's why. It makes sense to me that a company planning to release a chip roughly around the same time they're preparing to do a die shrink would spend some time doing the designs (80nm and 65nm) concurrently in the event it becomes necessary for whatever reason. I highly doubt the decision was "Hmm, 80nm doesn't work. We need to design a 65nm version quick!" I'm guessing the conversation was more along the lines of "OK, 80nm isn't working well. Let's delay a month and switch to plan B (65nm)."
In other words, I think they planned R600 to be an 80nm chip. I also think they worked on a 65nm design at the same time as a contingency plan. When they saw they weren't going to have an acceptable 80nm chip, they delayed the release to ramp up 65nm production. Finally, many months later they announced the delay under the silly premise of having a coherent product line (as if that's ever stopped them in the past), since there's no way you can switch process technology 6 weeks before release.
Makes sense to me anyway