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Check CPU speed settings on iMac G5s
Authored by: Anonymous on Nov 17, '04 09:50:28AM

Does choosing this setting impact the fans at all? Does running full-bore all the time make cause the fans to run faster/more often? This could be an issue if increased noise is a concern...



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Check CPU speed settings on iMac G5s
Authored by: greed on Nov 17, '04 10:29:32AM

I can't say for certain, but I would expect that the CPU is still "halted" while idle. So the system clock remains at high-speed, but if the system runs out of tasks which need to run, it will stop the CPU until something happens (timer expires, I/O completes, that sort of thing). When stopped, it will use a fraction of the power as compared to when it is executing instructions. And power is heat on a chip--it isn't turning into anything else.

So, combined with thermostatic fan controls, the fans should only come up to top speed if you're running a CPU-intense job, like video rendering or conversion, a big compile job, or some serious number-crunching.



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