"Apple have shown some absolutely stellar benchmarks with the Core solo and Core Duo processors outperforming their G4 based predecessors by quite a considerable margin in most areas, heavily vectorised applications are seemingly the only exception. The story is not quite so clear with the G5 based iMac but there is a difference even there. These benchmarks can be considered no doubt as justification for the decision to switch to x86 processors. However, in typical Apple style there is some slight of hand, in particular as regards timing of the switch. Making the transition 6 months early is no mistake, it was absolutely critical to get those benchmarks."