In the energy control panel on my brand new 15" powerbook HD, there is not an option for "Processor Performance" like on my 12" 1.33 iBook. Perhaps the new 15" Powerbook has a 7447, and not a 7447A G4? Seems absurd. I also tried to load FastAndSlow, and it stated my machine did not support DFS (Dynamic Frequency Shifting)! Is there anyway I can tell for sure, short of opening up the case. I tried to load CPU Director, but it complained that 'Kext' could not be loaded. Thanks.