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Possibly eliminate 'chirping' sounds from G5 CPUs System
If you've silenced your G5's fans, but your G5 still makes occasional odd noises -- quiet chirps and clicks -- then this hint might help. On my Dual 2.0 G5, I would hear these chirps and clicks on occasion, and couldn't ever tie them to anything the machine was doing. After doing some digging, I found a solution that worked for me, so I thought I'd share it here.

The solution to this chirping problem is to disable "CPU napping." From my understanding of it, this is a lower-power mode for the CPUs, invoked automatically by the G5's power management functions. But how does one do that, you may ask? You need to install CHUD, which is short for Computer Hardware Understanding Tools. It's linked on this page at Apple, and I think you get them automatically with Xcode (though I may be wrong). After installation, look in the Other section of System Preferences, and you'll see a new Processor panel (I think it's called Hardware in 10.3). Open that, and uncheck Allow Nap.

For me, that was the end of the chirps -- perhaps at the expense of a shorter CPU lifetime, but I'll take that risk for the silence gained. Also note that if you restart, the nap setting is reset (at least, mine is), so you'll need to re-open the prefs panel to fix it again. Alternatively, this older hint explained how to use a simple AppleScript to enable the nap setting at each restart. Change the =1 to =0 in the script, and you should have a "nap disabling" startup item (though I haven't tested this).

If you've got excessive G5 fan noise under 10.4.3, also see this hint.
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Possibly eliminate 'chirping' sounds from G5 CPUs
Authored by: pascalpp on Nov 07, '05 06:57:26AM

huzzah! i was having this chirping problem, and REALLY hating it. i noticed it most whenever i triggered Expose. chirp chirp chirp! now expose is totally silent, thanks to this hint!



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Possibly eliminate 'chirping' sounds from G5 CPUs
Authored by: egon0119 on Nov 07, '05 07:37:33AM

Yes! This hint worked for me as well. That sound was driving me crazy.



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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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Possibly eliminate 'chirping' sounds from G5 CPUs
Authored by: wonderyak on Nov 07, '05 09:40:39AM

In the interest of science (or at the very least, eliminating the irritating noise) I replaced the logic board, power supply and video card in my first gen 2.0DP (go AppleCare)...to no avail.

I was trying to avoid the Nap trick, because the idea of running my processor that hot all the time doesn't sit right with me. But, it looks like that's the only way.

What I've started to do is just turning napping off when the noise is unbearable, but mostly just living with it.



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Possibly eliminate 'chirping' sounds from G5 CPUs
Authored by: mrpants on Nov 07, '05 09:41:52AM

I have a first-gen Dual G5, and I've had the squeal, chirp, etc since day one.
I happens whenever there is "something" going on...network activity, moving something on the screen, disk activity, etc.

Well, I also did a little research, and I found that if I set my processor speed to "reduced" (Power Saver option), the squeal was virtually eliminated. Only the faintest of noises were still detectable.
If I also disabled the "Allow Nap", the machine becomes completely quiet (well, relatively quiet anyway).



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Possibly eliminate 'chirping' sounds from G5 CPUs
Authored by: DizzyPenguin on Nov 07, '05 11:48:47AM

[sarcasm]
Even better, if you hold the power button pressed in for a few seconds, it'll go completely quiet!
[/sarcasm]

---
DizzyPenguin



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Relief
Authored by: Colin Jensen on Nov 07, '05 04:33:25PM

Oh thank God. When watching TV with MythTV on my Mac, the computer was squealing like a banshee -- it wasn't some occational or ignorable issue.

Thanks.



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Possibly eliminate 'chirping' sounds from G5 CPUs
Authored by: artistek on Nov 08, '05 05:52:37AM

For what its worth. I eliminated the chirping sound by running Folding@home. I had a friend suggest it and it worked. Also it s a great way to freak out the apple techs after they have replaced the PSU twice and still can't come up with a solution.



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Possibly eliminate 'chirping' sounds from G5 CPUs
Authored by: vykor on Nov 08, '05 07:38:41AM

Definitely not just a G5 problem. Here on my Powerbook G4, under a certain range of (relatively light, but consistent) CPU load, the machine squeals and chirps. Solutions seem to be:

1). deactivate processor nap via CHUD - the noise instantly goes away
or
2). execute another program that pulls the CPU above this particular load range, or close down programs until load falls below the necessary range.

This is really irksome, and AppleCare doesn't seem to have any idea why. Interesting how nap would affect this noise.



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Will the chirping hurt the machine?
Authored by: aaronrp on Nov 10, '05 11:07:49AM

I guess my question is, is it OK for the machine that it's chirping? I'm in an environment where the chirp doesn't bother me much, and since it sounds like turning off processor nap is going to make the box heat more I won't do that, but I just want to make sure the machine is going to last a while.



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Possibly eliminate 'chirping' sounds from G5 CPUs
Authored by: sandeelinchu on Jan 12, '06 09:23:22PM

When I set processor performance to "reduced" in energy saver, it cut down the noise by half, but I found that disabling CPU2 in the CHUD "processor" panel got rid of the noise completely, even at highest processor performance.

I hope this does not mean something is wrong with my 212nd CPI

please advise



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Possibly eliminate 'chirping' sounds from G5 CPUs
Authored by: sandeelinchu on Jan 12, '06 09:26:21PM

sorry typo there..
i meant 2nd CPU



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