I here tell the 8900 is just a 80nm refresh....perhaps I'm....wrong?
Well according to the other BUZZ out there, the GF8900 wil be 90nm again, and nV is going to skip the 80nm half-node and jump straight to the 65nm for the G90. That is the current Buzz about that portion.
As for what I was referencing, Cleeve got it with the 25% hidden, which may or may not be the case (how many people talked about hidden GF7800 pipes to be unleashed [to 32] in reply to the X1800? but it turned out nope, just more speed and memory). Like I said we'll have to wait and see about that.
Also alot of the theoretical comparisons of architecture came from the 64 shader R600 #s, but if the recent specs are correct and the R600 is also a 128 shader part then that could change things, but also is it still dual issue, is it still Vec4?
There's many unanswered questions that really at this point just start spinning out of control the closer we get to launch (like the Hybrid G80 and the unified 24+8/8 R520).
I do find it funny though that really no one outside of the IHVs know JACK about the true inner workings of their hardware. Even Unwinder with his great Rivatuner tool didn't detect hidden components to the G80, so if they were there how would anyone even know, even with an XRAY?
ATi could come out with a die map that showed 12 shaders, if that's all they needed to enable to get the job done, and no one would know what the chip has despite logic and such because the numbers never translate exactly 1 to 1. Look at the GF7800 to GF7900 they reduced the transistor count without changing the level of functionality, well something had to give, what? No one seems to know and nV's not telling, even a year later it's not a known change, although I suspect it's legacy partial precision stuff they knew they didn't need once the GF7800 was a success.
So speculation will run rampant, and we can tell alot about what will be exposed, but likely there's secrets all over these things. Like the added AA modes in the last generations, not everything is exposed at launch.