Register FAQ / Rules Forum Spy Search Today's Posts Mark Forums Read
Go Back   MacRumors Forums > Apple Hardware > Desktops > iMac

Reply
 
Thread Tools Search this Thread Display Modes
Old Apr 6, 2008, 08:39 PM   #1
Jshwon
macrumors 6502
 
Join Date: Nov 2007
iMac operating temps

How hot dose your iMac run? I am using iStat pro so I'm not sure how accurate the readings are but mine shows the following:

CPU 103
GPU 128
GPU diode 128

Ambient 81

Mem controller 117
Airport card 113
HD Bay 128

These are all in fahrenheit. Are these high? I don't have the a/c on here in Houston. Just wondering if I am above or below norm.
__________________
24" iMac 2.4Ghz 320G 4GB Ram ~ 13" Aluminum MacBook 2.0Ghz ~32G iPhone 3G S⃣
Jshwon is offline   0 Reply With Quote
Old Apr 6, 2008, 08:46 PM   #2
flopticalcube
macrumors G4
 
flopticalcube's Avatar
 
Join Date: Sep 2006
Location: In the velcro closure of America's Hat
Those look perfectly fine. Nothing to worry about until you approach 190F.
flopticalcube is offline   0 Reply With Quote
Old Apr 6, 2008, 09:18 PM   #3
VoodooDaddy
macrumors 65816
 
Join Date: May 2003
all my temps are within 3-5 degrees of yours, imagine its fairly normal range.
__________________
24" Alu iMac, 2.8GHz, 4GB ram :: Android phone... I want an iPhone with a bigger screen! And taller doesnt = bigger to me.
VoodooDaddy is offline   0 Reply With Quote
Old Apr 6, 2008, 09:25 PM   #4
Leon Kowalski
macrumors 6502a
 
Join Date: Sep 2007
Location: Gondwanaland Reunification Front HQ
Quote:
Originally Posted by Jshwon View Post
These are all in fahrenheit. Are these high?
That HD Bay temp (53C) is VERY high. It's within a few degrees of any drive
manufacturers' absolute maximum operating temperature spec -- and hotter
than the peak transient temps observed with most drives during torture-test
benchmarking at tomshardware.com.

http://www23.tomshardware.com/storag...=1086&chart=39

...heat kills hard drives,

LK
__________________
One measurement is worth a thousand expert opinions.
Leon Kowalski is offline   0 Reply With Quote
Old Apr 6, 2008, 09:32 PM   #5
Jshwon
Thread Starter
macrumors 6502
 
Join Date: Nov 2007
Quote:
Originally Posted by Leon Kowalski View Post
That HD Bay temp (53C) is VERY high. It's within a few degrees of any drive
manufacturers' absolute maximum operating temperature spec -- and hotter
than the peak transient temps observed with most drives during torture-test
benchmarking at tomshardware.com.

http://www23.tomshardware.com/storag...=1086&chart=39

...heat kills hard drives,

LK
So this is the only temp that seems above normal? Anyone else drive running this hot?
__________________
24" iMac 2.4Ghz 320G 4GB Ram ~ 13" Aluminum MacBook 2.0Ghz ~32G iPhone 3G S⃣
Jshwon is offline   0 Reply With Quote
Old Apr 6, 2008, 09:44 PM   #6
Leon Kowalski
macrumors 6502a
 
Join Date: Sep 2007
Location: Gondwanaland Reunification Front HQ
Quote:
Originally Posted by Jshwon View Post
So this is the only temp that seems above normal?
It's the only one that would cause me any concern.

FWIW, my HD Bay normally idles at about 38C (100F).

LK
__________________
One measurement is worth a thousand expert opinions.
Leon Kowalski is offline   0 Reply With Quote
Old Apr 6, 2008, 09:47 PM   #7
Dimwhit
macrumors 68000
 
Dimwhit's Avatar
 
Join Date: Apr 2007
My HD temp is at 53 degrees. If that's too hot...well, I guess it's good I have a double backup system in case it fries.
__________________
iMac 2.8GHz/4GB RAM; Mac Mini 1.83GHz/1 GB RAM; iPhone 3G; MBP 2.33GHz/2GB RAM (work)
Dimwhit is offline   0 Reply With Quote
Old Apr 7, 2008, 04:04 AM   #8
Morod
macrumors 65816
 
Join Date: Jan 2008
Location: On The Nickel, over there....
My temps for comparison:

CPU 95
GPU 115
GPU diode 115

Ambient 70

Mem controller 101
Airport card 103
HD Bay 103

This is one hour after waking from sleep, just web browsing. My ambient temp is quite a bit cooler than you, and that could be the difference. Here are my fan speeds as well:

CPU Fan 1198
Hard Drive 1200
Optical drive 699

Hope this helps,
Morod
__________________
Everything should be made as simple as possible, but not simpler.
Albert Einstein
Morod is offline   0 Reply With Quote
Old Apr 7, 2008, 08:21 PM   #9
Jshwon
Thread Starter
macrumors 6502
 
Join Date: Nov 2007
Quote:
Originally Posted by Morod View Post
My temps for comparison:

CPU 95
GPU 115
GPU diode 115

Ambient 70

Mem controller 101
Airport card 103
HD Bay 103

This is one hour after waking from sleep, just web browsing. My ambient temp is quite a bit cooler than you, and that could be the difference. Here are my fan speeds as well:

CPU Fan 1198
Hard Drive 1200
Optical drive 699

Hope this helps,
Morod
Thanks, yeah mine are pretty on par with your numbers when the ambient temp is in the 70's. When I get home I turn the a/c off and now the ambient is up to 81 which seems to be causing the temp increase.
__________________
24" iMac 2.4Ghz 320G 4GB Ram ~ 13" Aluminum MacBook 2.0Ghz ~32G iPhone 3G S⃣
Jshwon is offline   0 Reply With Quote
Old Jun 23, 2010, 12:09 AM   #10
chkdg8
macrumors 6502
 
Join Date: Oct 2007
Location: Coral Springs, Florida
So, are these temps in the OK range? I'm using Fahrenheit scale. I'm afraid to post a pic of my temps during HL2 gameplay on Steam. I can fry an egg.
Attached Thumbnails
Click image for larger version

Name:	temps.png
Views:	193
Size:	77.4 KB
ID:	232781  
__________________
20" Aluminum iMac 9G55, 2.4 GHz, 4GB DDR2 RAM, 320GB HDD, SL 10.6.7 // 32GB iPhone 4 iOS 4.3.2
chkdg8 is offline   0 Reply With Quote
Old Jun 23, 2010, 12:37 AM   #11
aki
macrumors 6502a
 
Join Date: Mar 2004
Location: Japan
This topic has been covered a billion times already so search will give you more info but here's my basic take.

iMacs run a bit on the hot side.

They feel hot. This is normal - it's how they expel heat from the insides. iStat or similar should be your guide, not your fingers.

iMacs are well designed. If you use your iMac "normally" and expect it to last a "normal" lifespan you should forget iStat exists.

If you use your mac for heavy lifting for long periods, and/or you use Windows a lot, and/or you game in Windows, and/or you want your iMac to last into the 3-5 year bracket rather than the more normal 1-3 year one, then and only then you might want to consider the manual heat-management options available.

You can use iStat or iStat Pro to monitor temperatures. Most of your components, CPU, GPU and the like, are rated for very high temperatures indeed; temperatures you should never get even close to bar fan failure or similar dramatic hardware error. The most vulnerable component as a prev poster noted is your internal HD. Heat does, as noted above, kill. Which means, more soberly, sustained high temperatures will reduce the lifespan of your hard drive/make hard drive failure more likely.

Exactly what temperatures, opinions vary. Frankly, in this post-Timemachine era, everyone should be making frequent backups anyway. But that aside. From my reading of the bazillion posts I average it out that over 55 C for the HD is bad, and I personally try to keep it at around 50 C or under when I can. (When gaming, with fan management as outlined below, I end up with temps between say 50 and 55 C - not ideal in my book but it's not like I game 24/7.)

Note spiking in temps is ok, what we are talking about here is encoding video or marathon Halo sessions or whatever where the temps are high, regularly, for extended periods.

So, presuming you are concerned about your HD, and your usage is on the heavy side, there are a number of apps which allow you to manually manage your fan speeds. They work in different ways, the one I use(d) on my iMac, smcfancontrol, allows you to set profiles with different speed settings for each fan. I have a gaming profile which kicks up the fan speeds a little, and a Windows profile which kicks up the fan speeds quite a lot for when I'm gaming Windows-side.

Many people get paranoid about temperatures. Try to avoid this. The iMac is designed to expel heat, and you probably will be upgrading your hardware before your HD splutters, and anyway you have regular backups.

But, if you do use your machine for "pro" work, or if you game a lot, or if you are into granular control, iStat and smcfancontrol (or similar) are options which work well.

Final note, some people say these apps run the risk of wearing out your fans. That's true I guess, the question is which do you want to loose, your HD or your fan/s. Not that I'm a hardware type but I don't think the fans are especially fragile. But anyway its something else to consider.

Oh one last note: ambient temps seem to make a big difference, or at least a lot more difference than I would have guessed anyway. Where I live in Japan has a fair temperature variation between winter and summer and there is no question at all that internal temps are significantly lower in winter.

Last edited by aki; Jun 23, 2010 at 12:42 AM. Reason: Spelling
aki is offline   0 Reply With Quote
Old Jun 23, 2010, 04:00 PM   #12
chkdg8
macrumors 6502
 
Join Date: Oct 2007
Location: Coral Springs, Florida
aki, that was an amazing post. It definitely put things into perspectives. I kept searching on this subject and I came across an old, ugly, somewhat ridiculous but yet effective solution. I don't think I can go to that extent but hey, it works.
__________________
20" Aluminum iMac 9G55, 2.4 GHz, 4GB DDR2 RAM, 320GB HDD, SL 10.6.7 // 32GB iPhone 4 iOS 4.3.2
chkdg8 is offline   0 Reply With Quote
Old Jun 24, 2010, 08:01 AM   #13
aki
macrumors 6502a
 
Join Date: Mar 2004
Location: Japan
Quote:
Originally Posted by chkdg8 View Post
I kept searching on this subject and I came across an old, ugly, somewhat ridiculous but yet effective solution. I don't think I can go to that extent but hey, it works.
Actually, seeing that photo, I remember reading about those kinds of mods a while back. I'm no engineer or even close so I'm just repeating what I read, but I remember some people who sounded sort of clever (heh) saying that the iMac was designed to pull air from certain zones and push it to other zones and the fans are all in particular places etc etc - and that cutting holes and/or adding other fans messes with airflows/the magic of the design.

Which sounded plausible.

No idea really but I'm happy with smcfancontrol .
aki 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
Late 2013 rMBA 15" operating temps? Saviorrisen MacBook Pro 3 Feb 23, 2014 02:32 PM
Reinstalling operating system on iMac with no discs Axis Mundi Mac Basics and Help 2 Dec 28, 2013 04:10 AM
Are these temps to hot for an iMac? Lewb iMac 3 Dec 23, 2013 06:06 PM
iMac 27 inch scary temps JHorace iMac 4 Jan 27, 2013 08:55 PM
IMac 27 (2011) Fan spin-up temps. Imac Sam iMac 0 Jun 9, 2012 06:08 PM

Forum Jump

All times are GMT -5. The time now is 03:23 PM.

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

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