So my guess is, that they use EP3SL200 or 260.
It is definitely possible to put 3 fully unrolled pipelines into the 260
(at 150MH/s each) and, with some tuning, gain the advertised speed.
One question. Do you think it is possible for anyone with the experience necessary to design a custom FGPA board to get the power draw so wrong like BFL claims they did.
I mean 1GH @ 20W on a 65nm FPGA? My albeit indirect knowledge says that isn't just good it is downright impossible. I don't care what chip you use you aren't getting that level of performance from a 65nm tech. They should have known it was impossible right? I mean it would be like Toyota changing one component in their Prius and the simulated/tested gas mileage goes from 40mpg to 300 mpg. It is obvious that is impossible. Toyota wouldn't be announcing the 2013 Prius getting 300 mpg.