Well, cpu's with the core blue in coler rather than green come from the dresden plant. No durons are made in the dresden fab, and at this point, to my knologe, all Tbirds faster than 1ghz are made at the dresden plant as are some of the 1ghz chips, although hardocp once mentioned getting several bluecore 750s that would all do 1ghz several months ago. (my thought on that would be that amd was producing more high end chips than there was a market for, and thus sold some chips that would do 1ghz as 750's.
-Az