Is it possible to replace the G4 processor in the powerbook with a P4M (Mobility Pentium 4) even if it means having to replace or modify the motherboard or anything else, and can you make the HDD RPM's faster in the powerbook?
What you're looking at would be much more trouble than it's worth. Just wait until Apple starts releasing PowerBooks with Pentium Ms. A new one of those would probably cost you less and consume much less of your time. If, however, you do find a feasible way to accomplish this task, more power to you. Rock on, and such... Yeah... By the way, what size PowerBook are you thinking of doing this overhaul on?
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Cheers! :-) - JediJoker
Current: - "ProBook:" 15.4" MacBook Pro Core 2 Duo 2.33 GHz - Mac Classic II - Old PowerBook
Moved On: - "The Book of Power:" 12.1" PowerBook G4 Aluminum 1.33 GHz - Purple iMac
Why in the world would you want to do that! Leave the Powerbook alone man. Except the HD, you can replace it with a 7200rpm model, but it will cost ya. -maestro