SMART Utility vs smcFanControl - HD temp discrepancy

Discussion in 'iMac' started by djc6, Mar 7, 2011.

  1. djc6 macrumors 6502

    Joined:
    Aug 11, 2007
    Location:
    Cleveland, OH
    #1
    I replaced the HD in my iMac, the Western Digital Caviar Blue it came with failed. Anyways, I noticed that SMART Utility reports the drive as being 51C and smcFanControl says 41C - which should I trust? Thats a pretty big discrepancy. Makes me wonder if I put the HD sensor back on right.
     
  2. djc6 thread starter macrumors 6502

    Joined:
    Aug 11, 2007
    Location:
    Cleveland, OH
    #2
    Ran the fan at max for a few minutes... now smcfancontrol says 40C, SMART Utility and SMARTreporter say 44C - so there is still a discrepancy, but its less of one.
     
  3. MacHamster68 macrumors 68040

    MacHamster68

    Joined:
    Sep 17, 2009
    #3
    and that is normal , because smc is using the heat sensor attached to the outside of the harddrive , and smart is using a sensor inside the harddrive so the smart reading will always be higher...
    i think the 09 10 and 2011 Macs use internal smart sensor
     
  4. djc6 thread starter macrumors 6502

    Joined:
    Aug 11, 2007
    Location:
    Cleveland, OH
    #4
    It just bothers me that the fan control is being based on the sensor with the lower reading. Unless 50C is normal for an all-in-one computer like the iMac. 50C seems average based on the submitted user info on this site:


    http://www.intelmactemp.com/
     
  5. mjsmke macrumors 6502a

    Joined:
    Mar 2, 2010
    Location:
    UK
    #5
    50c is fine. Most modern CPU's can run at well over 80c so dont worry.
     
  6. MacHamster68 macrumors 68040

    MacHamster68

    Joined:
    Sep 17, 2009
    #6
    as long as the hdd stays under 60 degree most of its time its fine, and yes All In One computers run a bit warmer generally in comparison with desktops which are easier to cool as enough space for big efficient fans inside
     

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