smcFanControl 0° but back of iMac 27" is hot

Discussion in 'iMac' started by Air2, Jun 24, 2011.

  1. Air2 macrumors member

    Joined:
    May 24, 2011
    Location:
    Germany
    #1
    The back of my new iMac (mid-2011 27" Ultimate) is hot and even CDs are warm after copying, so I installed smcFanControl. It reads 0°C and 1224 rpm on the ODD, 1100-1426 rpm on the HDD and 939 rpm on the CPU. Should I be worried? :confused:
     
  2. flatfoot macrumors 65816

    Joined:
    Aug 11, 2009
    #2
    Which sensor reads 0°C? Please list all temperature sensor values smcFanControl displays.
     
  3. Air2 thread starter macrumors member

    Joined:
    May 24, 2011
    Location:
    Germany
    #3
    The program does not list the sources of its readings. It currently shows
    0°C 1448 rpm if I set ODD in Preferences
    0°C 1451 rpm if I set HDD in Preferences
    0°C 1199 rpm if I set CPU in Preferences

    Thanks for your help.
     
  4. Air2, Jun 24, 2011
    Last edited: Jun 24, 2011

    Air2 thread starter macrumors member

    Joined:
    May 24, 2011
    Location:
    Germany
    #4
    I just installed TemperatureMonitor.dmg to supplement the information. It is not designed for the current iMac, so it might not read all temperature sensors. The ones it reports are
    24°C for Ambient Air
    45°C for CPU A Heatsink
    53°C for CPU A Proximity
    51°C for CPU Core 1
    46°C for CPU Core 3
    50°C for CPU Core 5
    47°C for CPU Core 7
    55°C for Display Screen Proximity
    68°C for Graphics Processor Heatsink 1
    76°C for Graphics Processor Temperature D
    54°C for Main Logic Board
    51°C for Optical Drive
    65°C for Power Supply Position 2
    63°C for Primary Heatsink
    45°C for SMART Disk Apple SSD
    59°C for SMART Disk Hitachi
    72°C for Secondary Heatsink

    Can anyone compare that to their values?

    Current room temperature is 24°C (up from 22°), so the iMac is heating my room. :)
     
  5. rj86 macrumors member

    Joined:
    Jun 9, 2011
    #5
    Mine is the same, would imagine it's the fact they've not had their temp sensor profiles added yet.
     
  6. Spike88, Jun 24, 2011
    Last edited: Jun 24, 2011

    Spike88 macrumors 6502a

    Joined:
    Jan 25, 2010
    #6
    Hi there...

    At this point in time, the SMCControl program isn't a perfect program. The same program on my 2010 iMac shows a "0" value for its internal HD reading as well. But, iStat Nano (free widget from iSlayer) shows the RPM and temp numbers properly.

    For readings on my iMac (ony my 2010 - 21.5" model), see:
    http://i178.photobucket.com/albums/w251/Spike99-Pictures/New iMac system/FanSpeedJune25-2011.png
    http://i178.photobucket.com/albums/w251/Spike99-Pictures/New iMac system/InternalTemps2010-08-30.png

    Note: I set my iMac fans to "minimum" 1400 with threshold of 75 C. This keeps my iMac much cooler. Especially under heavy loads.

    Hope this helps in your iMac 27" research....

    .
     
  7. philipma1957 macrumors 603

    philipma1957

    Joined:
    Apr 13, 2010
    Location:
    Howell, New Jersey
    #7
    I went a step further and purchase istatmenus

    http://bjango.com/mac/istatmenus/

    cost is 16 dollars for 1 computer and 25 for family pack. it allows 6 fans speeds. my slowest speed is very quiet so I set the machine at slow but when I want I can really speed it up with the fast setting. for a 1600 dollar plus computer the amount of control a 16 dollar program allows is worth it.
     

    Attached Files:

  8. cooky560 macrumors regular

    cooky560

    Joined:
    Jun 8, 2011
    Location:
    Around
    #8
    smcFanControl says 0c for me too, but it still controls the fans and it seems to work well enough
     

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