Originally posted by Ensoniq
G3 - Apple's marketing term for ANY processor based on the original PPC 750 instruction set. Made both by IBM and Motorola. Even IBM's latest PPC 750 GX, with speeds over 1 GHz, are considered G3 chips by Apple.
G4 - Up until now, Apple's marketing term for ANY processor based on the original PPC 7400 instruction set by Motorola, which essentially was an enhanced G3 + AltiVec. Based on that definition, IBM's upcoming (announced, not myth) PPC 750 VX would be considered a G4, because it's a 32-bit G3 with AltiVec.
Thanks for the clarification. I learnt something new today