Is the 1.5 processor in the current PB really an overclocked version of the very same processor in the lower model 1.33 PB? Or is it a different processor altogether? Also in regards to the ibooks i have the very same question in fact are all the g4 chips in apples line of notebooks the same processors but some are just overclocked? The reason i ask is because ive heard that overclocking causes excess heat and reliability issues but that has been said for PC's and it may be different for Mac's i dont know Maybe thats why the PB tends to run hotter than the ibook? Any input?