Original sentence: All PowerPC 970 models lack the instruction to do little/big endian swapping.As a result, Apple's laptops continued to be fitted with the older G4 chip until the Apple-Intel transition, when the iBook and PowerBook were replaced by the MacBook and MacBook Pro equipped with 65 nm Intel Core processors and, later, with Intel Core 2 processors with a TDP of 20-34 W.The 130 nm desktop version PowerPC 970 ran at higher temperatures than older PowerPC chips, meaning it could not be fitted into Apple's PowerBook or iBook that were using the 130 nm PowerPC G4 which typically drew between 6 watts at 600 MHz and 21 watts at 1.42 GHz.The PowerPC 970 lacks certain features that the POWER5 processors have, such as virtualization, and microcode necessary to run i5/OS; as a result, IBM cannot make PowerPC 970-equipped blade modules for its System i server line.This proved to be a problem for Microsoft Virtual PC, which relied on this feature in G3 and G4 processors to accelerate performance