Go Back   MacRumors Forums > Apple Hardware > Desktops > iMac

Reply
 
Thread Tools Search this Thread Display Modes
Old Feb 14, 2013, 10:35 AM   #1
Goftrey
macrumors 68000
 
Goftrey's Avatar
 
Join Date: May 2011
Location: Wales, UK
Loud Fans - Only in OS X?

I received my late 2006 17" iMac yesterday and am absolutely chuffed with it. However, OS X is handling the fans in a very odd way; I downloaded smcFanControl (as I do on every Mac I own) & was looking (& listening) to the fan sensors. Idling, the ODD & HDD fans are at 4000rpm, whereas the CPU is only at 1000. It's making quite a noise. Then, when I boot into XP via Boot Camp, every is silent, even when playing a pretty intense game. Is this natural? Are the fans automatically defaulted to a higher RPM in OS X? I'd just like to find out if it's a software issue before opening him up & taking a gander myself. Thanks.
__________________
Mac Pro 4x2.66GHz, 6GB, GTX660, Yose | 13" MacBook Air 2x2.13GHz, 4GB, 320M, Yose | 20" Alu Cinema Display
PowerMac G4 Cube 1.2GHz, 1.5GB, 6200, Leo | OnePlus One 64GB | Canon EOS M 18-55mm, 22mm
Goftrey is offline   0 Reply With Quote
Old Feb 14, 2013, 10:40 AM   #2
simsaladimbamba
Guest
 
Join Date: Nov 2010
Location: located
Have you tried an SMC reset yet?[Indent]Intel-based Macs: Resetting the System Management Controller (SMC) (Apple Support Site)

Normally the HDD and ODD fans are idling at 900 to 1,200 RPM in an iMac.
simsaladimbamba is offline   0 Reply With Quote
Old Feb 14, 2013, 10:49 AM   #3
Goftrey
Thread Starter
macrumors 68000
 
Goftrey's Avatar
 
Join Date: May 2011
Location: Wales, UK
Just performed the reset & it's still idling at 4k.
__________________
Mac Pro 4x2.66GHz, 6GB, GTX660, Yose | 13" MacBook Air 2x2.13GHz, 4GB, 320M, Yose | 20" Alu Cinema Display
PowerMac G4 Cube 1.2GHz, 1.5GB, 6200, Leo | OnePlus One 64GB | Canon EOS M 18-55mm, 22mm
Goftrey is offline   0 Reply With Quote
Old Feb 14, 2013, 10:51 AM   #4
chrfr
macrumors 68020
 
Join Date: Jul 2009
Quote:
Originally Posted by Goftrey View Post
Just performed the reset & it's still idling at 4k.
It's not truly idling then. Open Activity Monitor, set it to show all processes and sort by CPU%. Something is making it work.
chrfr is offline   0 Reply With Quote
Old Feb 14, 2013, 10:54 AM   #5
Goftrey
Thread Starter
macrumors 68000
 
Goftrey's Avatar
 
Join Date: May 2011
Location: Wales, UK
Quote:
Originally Posted by chrfr View Post
It's not truly idling then. Open Activity Monitor, set it to show all processes and sort by CPU%. Something is making it work.
Not a lot going on there..
Attached Thumbnails
Click image for larger version

Name:	Screen Shot 2013-02-14 at 16.53.03.png
Views:	26
Size:	433.3 KB
ID:	396936  
__________________
Mac Pro 4x2.66GHz, 6GB, GTX660, Yose | 13" MacBook Air 2x2.13GHz, 4GB, 320M, Yose | 20" Alu Cinema Display
PowerMac G4 Cube 1.2GHz, 1.5GB, 6200, Leo | OnePlus One 64GB | Canon EOS M 18-55mm, 22mm
Goftrey is offline   0 Reply With Quote
Old Feb 14, 2013, 11:18 AM   #6
Goftrey
Thread Starter
macrumors 68000
 
Goftrey's Avatar
 
Join Date: May 2011
Location: Wales, UK
Okay, I just installed Fan Control & found the base rpm is set at 3500rpm. So I set that down to 1000 & have been doing various stress-tests while keeping an eye on the temps. The iMac is now dead-silent & none of the temperatures have shot up at all. Little bit weird but everything's all good now. Thanks for the replies
__________________
Mac Pro 4x2.66GHz, 6GB, GTX660, Yose | 13" MacBook Air 2x2.13GHz, 4GB, 320M, Yose | 20" Alu Cinema Display
PowerMac G4 Cube 1.2GHz, 1.5GB, 6200, Leo | OnePlus One 64GB | Canon EOS M 18-55mm, 22mm
Goftrey is offline   0 Reply With Quote
Old Feb 14, 2013, 07:21 PM   #7
iSmack
macrumors newbie
 
Join Date: Jul 2006
Location: Denmark
Isn't 1000rpm dangerously low?
iSmack is offline   0 Reply With Quote
Old Feb 14, 2013, 09:57 PM   #8
WilliamG
macrumors 603
 
Join Date: Mar 2008
Location: Seattle
Quote:
Originally Posted by iSmack View Post
Isn't 1000rpm dangerously low?
Doubt it. Probably the factory-default speed. On the 2012 27" iMac it's 1200rpm.
__________________
iMac, MacBook Air, Mac mini, iPad, iPhone, 55-11
www.bighugenerd.com
WilliamG is offline   0 Reply With Quote
Old Feb 14, 2013, 10:41 PM   #9
aggri1
macrumors regular
 
Join Date: Jul 2010
I know this is totally unrelated, but on my iMac (a 2010 model), the fans only get noisy in Windows, when playing video games. And even then, it's not load at all. I wonder how this is related to the significantly superior performance of games in Windows compared with Mac OS X...
aggri1 is offline   0 Reply With Quote

Reply
MacRumors Forums > Apple Hardware > Desktops > iMac

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
thread Thread Starter Forum Replies Last Post
Loud and heated fans? Bilalo MacBook Pro 5 Oct 31, 2013 09:07 AM
Loud fans! bro4dhead MacBook Pro 2 Feb 22, 2013 04:25 PM
Fans run really loud whenever I use my Macbook Pro brittanylynn01 MacBook Pro 1 Dec 24, 2012 10:08 AM
iMac 12.2 loud fans ezpac iMac 1 Nov 12, 2012 02:37 PM
My replaced HD fans are really loud. Chumburro2U iMac 8 Oct 25, 2012 01:06 AM

Forum Jump

All times are GMT -5. The time now is 09:34 AM.

Mac Rumors | Mac | iPhone | iPhone Game Reviews | iPhone Apps

Mobile Version | Fixed | Fluid | Fluid HD
Copyright 2002-2013, MacRumors.com, LLC