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Possibly eliminate 'chirping' sounds from G5 CPUs
Authored by: neilio on Nov 07, '05 09:22:53AM

Keep in mind that disabling nap means your CPU will run at full speed all the time. This means vastly increased CPU temperatures, which will probably cause more issues (and fan noise) than it's worth. When I uncheck nap on my iMac G5 my CPU temperature jumps between 9-11 degrees Celsius, hovering near 76 degrees Celsius as long as nap is turned off; not trivial by any extent.

---
Slumming at http://www.beatnikpad.com/



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Possibly eliminate 'chirping' sounds from G5 CPUs
Authored by: robg on Nov 07, '05 09:45:18AM
Zowie, that's warm. Yes, there is a temperature increase in non-nap mode. In my case, the gap is the similar, but the overall temps are lower:

In "normal" mode (no games or other high-CPU actions running), I see between 48C and 52C (118F and 124F) with nap enabled. When I disable nap, these jump to the 54C to 58C (131 and 138F) range. This is on a Dual G5 2.0GHz machine.

If you're worried about such things, there are a fair number of temperature probes apps and widgets out there to keep an eye on the temps. One such app is Hardware Monitor. On the FAQ page for that app, you'll find this statement:
"Note that all up-to-date Macintosh models automatically shut down or enter sleep mode if one of the readings exceeds a critical limit. For this reason it is impossible that your computer can be damaged in an overtemperature condition.
So I feel pretty good that no harm will come to my machine by disabling nap, but as always -- buyer beware, I won't be held responsible, etc...

-rob.

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Possibly eliminate 'chirping' sounds from G5 CPUs
Authored by: nealdd on Nov 07, '05 03:39:03PM

No change in my Rev B iMac 20" "chirping' sounds"
I do have the higher temps
I also changed midplane -PSU
and HD. the 'chirping' sounds are driving me @#$%



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