Quiet, Mac!

by David Battino

With one click, Spencer Critchley just eliminated the nail-dragging squeak my dual-G5 used to make every time it ran a complex screen saver or iTunes visualizer. His tip was to disable processor napping.

processor preference pane

Click once, squeaks vanish. Disabling processor napping on my dual G5 eliminated the squeaking sounds it made when running complex visuals. But could there be any drawbacks?


Rob Rix
2007-07-02 17:57:43
Neat. I'm going to try this for a couple of days with my iMac G5 (Rev A).
Rob Rix
2007-07-02 18:02:25
Ouch, cancel that! Fan noise is nearly at its maximum when I turn off napping with my iMac. Pity!
2007-07-02 23:52:59
Try this: disable nap then disable CPU 2. Then re-enable nap and re-enable CPU2. It works - don't ask me why.
David Battino
2007-07-03 00:11:32
@Rob: For what it's worth, my fan's running pretty quiet now.
Spencer Critchley
2007-07-03 11:24:39
Thanks for all the additional tips, David! Speaking of padded enclosures, I use a Raxxess Isoraxx to house the Mac and several drives. It works fairly well. It uses quiet, variable-speed fans, which generate quite a lot less noise than all those components would unhoused. In the past I've used custom-built enclosures that exhaust their fans into a neighboring room or to the outside. That approach is quieter still, but of course makes for a bigger (and potentially riskier) project.

2007-07-10 16:52:24
As an answer to your embedded questions:

As far as I can tell, no, intel macs do not "squeal" :)
At least I haven't heard any from MacPro's MacBook's or MacBook Pro's YMMV.

David Battino
2007-07-10 18:18:58
@Anonymous: Thanks. My G5 doesn’t squeal anymore either. ;-) Still, for recording, I’ll probably continue to use a long mic cord.
2007-07-11 18:43:37
Check you processor temp when disabling Nap. I found mine sky-rocketed seconds after disabling it.
2007-09-29 09:35:13
Help! After upgrading to Tiger, I no longer have a tool to turn off napping! no hwprefs in CHUD 4.4.4! The chirping is back worse than ever? Any other version work with Tiger? I'm dead in the water until I fix it again. Any suggestions?
2007-10-30 21:41:23
Always, enable the 'Allow Nap' processor because it reduces the power consumption and heat, there will not be any adverse effects, but your mac may run warmer and consume more power.If you disable the processor, it shortens your CPU's life because of the heat and constant strain.