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I wasnt a G5 owner, waited for the Intel switch, but I gather the G5 water cooling had a very high failure rate and this was at least a large part of why Jobs dropped IBM/MOT/PPC int he end. They promised him a high clock, air cooled G5 but couldn't deliver.

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The bigger issue was that they couldn’t get the G5 to work in a laptop and this was killing Apple. Apple’s laptops have always been a cut above their PC counterparts in terms of design, but in those days it felt like Apple Laptops were from a different planet, except they were unreasonably slow in large part because they were stuck on the G4 processor for years. Switching to intel was a necessity for survival. IBM just couldn’t deliver or keep up with what Intel was doing.

> They promised him a high clock, air cooled G5 but couldn't deliver.

Then how were IBM processors cooled ? IBM used also PowerPC

IBM version of G5, POWER4 and POWER5, was clocked a bit lower than G5, and their servers and workstations had extremely loud fans.

If you've never been around an AIX Power server: they're extraordinarily loud. Usually these 3/4U rack servers that sound like a plane taking off.

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