30%, clock per clock, is actually a great advantage indeed! (although the initial clock rates won´t be over 2Ghz, if I´m right, will they?) I´m curious to see the real benefits. Opteron will be here soon, much sooner than Athlon 64. The way I see it, Opteron is set to have a good launch, and many people will recognize its advantages. It won´t be stellar, though. On the other hand, I don´t see a clear picture for Athlon 64. If indeed prescott has the extensions, then it can be rather devastating: just picture a 3.6Ghz, 800Mhz FSB, doubled caches, Ht-enhanced, prescott with improved architecture and 64-bit extensions on a PAT-canterwood with dual DDR400... And even without the extensions, prescott is looking quite good on paper.
Then again, Athlon 64 has been "looking good on paper" for years now... It´s going to be an interesting year for CPUs, I guess!