difference between ibook and powerbook 12inch? in Hardware Stuff Posted November 4, 2005 I think there are fewer bottlenecks in the PowerBooks which in turn makes them faster even with similar specs. Like, the frontside bus or somethin is faster on the PowerBook. I dunno. But they are faster that's for sure. Larger and faster hard drives is another thing... 40 GB at 4200 RPM versus 60 GB at 5600 RPM. That makes a difference. I also prefer the PowerBook keyboard, firmer and quieter.