One of the reasons is becuase Motorola processors are simply more expensive than Intel ones. However, Motorola also has deals with Apple, so they may be getting the processors cheaper. Additionally, Apple buys some of the processors from IBM. Motorola processors are not necessarily designed with Apple in mind. PowerPC processors are designed for high demand applications such as superfast telecom, embeded sectors, etc. Intel chips are only designed for PCs. Furthermore, the 128 bit path has a much lower yeild that Intel's 32 bit path. Getting superfast G4s requires almost unprecedented technology at fabrication time technology which is not cheap by any means. However 32 bit paths have been around forever, so no super new fabrication techniques need to be used. G4 chips are also copper based whereas the Intel chips are Aluminum based. Quite simply, it costs more to manufacture. But honestly, which would you rather use?
- Andrew