Prescott's 64-bit performance is sometimes worse than its 32-bit when AMD's isn't in the same benchmark so this is not remotely a minor issue about degree here. AMD64 was designed with the K8 architecture in mind so nothing is a given as you are hopefully assuming although you would expect it to be ok given the time they have had to start a clean sheet x86-64 P-M and given the similiarity of P-M to PIII which isn't a bus ride away from the K7/8s like P4 is.
How would we know? AMD nevers announces a tapeout and only sometimes mentions it after the event has occured if an interviewer happens to ask the right person the right question at the right time. Nor do they typically talk about the test SRAMs on a new process except very sporatically. Since when they mention or show milestones doesn't seem to correlate at all with how well the process is doing, you can't even use these sporatic sightings as meaning anything...
Market Data 
Markets 
AI
