The PowerPC 601 featured a single-cycle floating point MAC unit, which made Macs at the time much faster at multimedia tasks than their x86 IBM-PC counterparts. Single cycle FP MAC units didn't make it to the x86 world until much later.

Also, the Altivec vector unit introduced with the PowerPC G4 beat the pants off of the equivalent vector units in the x86 world for years after Altivec was released.