iMac operating temps

Discussion in 'iMac' started by Jshwon, Apr 6, 2008.

  1. macrumors 6502

    Jshwon

    Joined:
    Nov 2, 2007
    #1
    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.
     
  2. macrumors G4

    flopticalcube

    Joined:
    Sep 7, 2006
    Location:
    In the velcro closure of America's Hat
    #2
    Those look perfectly fine. Nothing to worry about until you approach 190F.
     
  3. macrumors 65816

    Joined:
    May 14, 2003
    #3
    all my temps are within 3-5 degrees of yours, imagine its fairly normal range.
     
  4. macrumors 6502a

    Leon Kowalski

    Joined:
    Sep 20, 2007
    Location:
    Gondwanaland Reunification Front HQ
    #4
    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/storage.html?modelx=33&model1=1013&model2=1086&chart=39

    ...heat kills hard drives,

    LK
     
  5. thread starter macrumors 6502

    Jshwon

    Joined:
    Nov 2, 2007
    #5
    So this is the only temp that seems above normal? Anyone else drive running this hot?
     
  6. macrumors 6502a

    Leon Kowalski

    Joined:
    Sep 20, 2007
    Location:
    Gondwanaland Reunification Front HQ
    #6
    It's the only one that would cause me any concern.

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

    LK
     
  7. macrumors 68000

    Dimwhit

    Joined:
    Apr 10, 2007
    #7
    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.
     
  8. macrumors 65816

    Morod

    Joined:
    Jan 1, 2008
    Location:
    On The Nickel, over there....
    #8
    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
     
  9. thread starter macrumors 6502

    Jshwon

    Joined:
    Nov 2, 2007
    #9
    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.
     
  10. macrumors 6502

    Joined:
    Oct 24, 2007
    #10
    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.
     

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  11. aki
    macrumors 6502a

    Joined:
    Mar 2, 2004
    Location:
    Japan
    #11
    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.
     
  12. macrumors 6502

    Joined:
    Oct 24, 2007
    #12
  13. aki
    macrumors 6502a

    Joined:
    Mar 2, 2004
    Location:
    Japan
    #13
    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 :) .
     

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