smcFanControl 0° but back of iMac 27" is hot

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

  1. Air2 macrumors member

    May 24, 2011
    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

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

    May 24, 2011
    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

    May 24, 2011
    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

    Jun 9, 2011
    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

    Jan 25, 2010
    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: iMac system/FanSpeedJune25-2011.png 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


    Apr 13, 2010
    Howell, New Jersey
    I went a step further and purchase 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


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

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