iMac 'Ambient Temperature'

Discussion in 'iMac' started by TW95, Dec 25, 2012.

  1. macrumors member

    May 26, 2010

    I have a new iMac 2012 which was delivered about a week ago, everything is working fine but one thing seems to intrigue me...

    The ambient temperature sensor. I am using iStat as a dashboard widget and the ambient temperature reading is hovering around the 5-7 degrees Celsius mark. Obviously this isn't the temperature of the room I am in which is what the ambient temperature is.

    Does anyone have any ideas on why the reading is so low?

    Something else interesting is that the air temperature outside corresponds almost exactly to the ambient temperature reading on the iMac.

    Thanks for reading, look forward to hearing your replies.
  2. macrumors 6502a

    Jun 24, 2012
    Is that a 27" iMac 2012?

    I know my old 2006 iMac had an ambient temp sensor, and it always read a couple of degrees above the temp of the room since I figured inside the case was always a bit warmer.

    My new 27" 2012 iMac doesn't have an ambient sensor. It has:

    CPU Proximity (assume it's on the logic board next to the socket)
    GPU Die (Nvidia's on-die temp sensor for the 680MX)
    LCD Proximity (attached to backside of LCD panel)
    MLB Proximity (I assume this might be the ambient temp sensor - just measuring the local temp near the logic board)
    PCH Die (on-die sensor in Intel's platform controller hub chip)
  3. thread starter macrumors member

    May 26, 2010
    Sorry, it is the 21.5" model. On iStat my temps are: Apple SSD, Apple HDD, Ambient, GPU Diode, Mem bank A1, Mem controller. They are the ones that are listed. Current reading is 7 Celsius.
  4. macrumors 6502a

    Sep 3, 2009
    These are the temps on my 27 inch (in F) I've got the ambient temp. I just started using it from a period of sleep, but it's pretty low, lower than the room temp.

    Attached Files:

  5. thread starter macrumors member

    May 26, 2010
    That ambient temperature is similar to my reading. It's at 7 (C) at the moment, yours translates to be about 8.8 (C).

    I guess then no one has any idea why the reading is so low?
  6. macrumors P6


    Jan 24, 2010
    Maybe iStat needs to be updated to work correctly with the new machines.
  7. macrumors regular

    Nov 21, 2012
    Suffolk UK
    Mine says 1deg C :eek:

    No way is my study anywhere near that temp, it seems pretty meaningless, at that least that is what I have assumed, unless there is built in Air-Con?
  8. macrumors 6502a


    Sep 26, 2009
    Durham, UK
    The ambient sensor in my brand new Mini isn't correct either. Although iStat shows it correctly before i migrated from my last Mac (an iMac) it must be an issue with the newer 2012 models not working with iStat correctly, this kind of thing has happened before and an iStat update usually fixes it
  9. macrumors 6502a

    Mar 8, 2008
    the main reading for the ambient temp sensor is not the room, its an estimate mix of the temperature around the components internally.
  10. macrumors member

    Oct 9, 2012
    HI guys, I am using Istat version 4.03, and i cant find ambient temp.Where is it located,, My CPU Proximity averages between 41-50 Degrees
  11. macrumors newbie

    Mar 12, 2013
    My new late-2012 iMac "Ambient Air" temperature sensor reads 48F/9C all of the time too.
  12. macrumors 68000


    Apr 15, 2012
    United Kingdom
    My 27" late 2012 iMac is showing 13 degrees C for ambient temperature.
  13. macrumors member

    Feb 14, 2013
    iStat is currently not working for the 2012 iMac. Mine shows an ambient temperature of 1 degree Celsius, and I am living in the tropics...
  14. macrumors newbie

    Sep 24, 2012
    Spey Valley
    I think iStat needs updating - I have an ambient temperature reading of 1 degree C - freezing :eek:
    - or 255 degrees C melt down :eek::eek: - nothing in between - and I live nearer the North Pole than the tropics :D


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