Original sentence: At 1.5 GHz, the G5 was not substantially faster than the 1.5 and 1.67 GHz G4 processors which Apple used in PowerBooks instead.Despite intense user demand for a faster laptop CPU than the G4, Apple never used a G5 series CPU in their PowerBook laptops.Finally, the 970FX had inadequate power saving features for a portable CPU.Furthermore, the northbridge chips available to interface the 970FX to memory and other devices were not designed for portable computers, and consumed too much power.However, several obstacles prevented even the 970FX from being used in this application.Its minimum (idle) power was much too high, which would have led to poor battery life figures in a notebook computer.The 970FX reduced thermal design power (TDP) to to about 30 W at 1.5 GHz, a figure which led many users to believe a PowerBook G5 might be possible.The original 970 used far too much power and was never seriously viewed as a candidate for a portable computer
Edited sentence: Earlier into the introduction of the 970, the heat dissipation was indeed too high for use in a laptop.However that deal dissolved as well as Apple moved over to x86 processors from Intel.However, one of the goals for the development of the 970FX was to reduce thermal design power ( TDP) to acceptable levels for use in heat sensitive applications like a portable computer.Indeed, the 970FX only generated around 30 W TDP at 1.5 GHz, which while slower in clock speed over Motorola/Freescale's older G4 processors, would have maintained the advanced design of the 970 like full 64 bit design and better clock scalability.It was also debated that Apple would use P.Semi's PWRficient chip which had even better TDP levels.There was much controversy surrounding Apple's refusal to use the 970FX for their PowerBook laptops