Imac G5 17" 1.8GHz Rev A: -Wanted to see if I could reduce temps with good cleaning and thermal paste redo. -Using ifixit and "arctic sliver mx-2" I reduced cpu temp on average from 67c to 55c. -This and a good cleaning of fans ect really helps in reducing heat and noise! ps: will probably order a new cpu fan from ebay as these are know for being somewhat loud. Here are some pics...if you have any questions,feel free to ask.