Weird negative temp in istat pro

Discussion in 'MacBook Pro' started by bozz2006, May 13, 2011.

  1. bozz2006 macrumors 68030

    bozz2006

    Joined:
    Aug 24, 2007
    Location:
    Minnesota
    #1
    Has anyone else experienced this? I've attached a pic. It's the "GPU Diode" temp that's whacky.
     

    Attached Files:

  2. snaky69 macrumors 603

    Joined:
    Mar 14, 2008
    #2
    The sensors is either disconnected or has failed.
     
  3. bozz2006, May 13, 2011
    Last edited: May 13, 2011

    bozz2006 thread starter macrumors 68030

    bozz2006

    Joined:
    Aug 24, 2007
    Location:
    Minnesota
    #3
    Hmmm... Should this worry me? If it's basically inconsequential I'd rather not have to get it repaired. I wonder if this diode is tucked away or if perhaps I broke it or disconnected it when I had the computer open.
     
  4. snaky69 macrumors 603

    Joined:
    Mar 14, 2008
    #4
    They are a cheap part, under $15 I think. Apart from the machine not knowing if it is overheating or not, there isn't much impact. You can change it if you want, I know I would especially if I still was in the warranty period.
     
  5. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #5
  6. bozz2006 thread starter macrumors 68030

    bozz2006

    Joined:
    Aug 24, 2007
    Location:
    Minnesota
    #6
    I just did a little experiment. Interestingly enough it only shows a negative temp when I'm on the integrated GPU. If I use gfxcardstatus to switch to the discrete gpu, it shows up as a positive value; ~113 degrees F in light use.

    Perhaps it only reports on the discrete gpu, and when the integrated GPU is active, it reports that negative value.
     
  7. Final Hour macrumors newbie

    Joined:
    Oct 31, 2010
    Location:
    Israel
    #7
    Exactly correct, Bozz. This happens within istat where once the dGPU is forced it will display a positive number (actual), once it pushes to integrated again istat doesn't recognize the change and displays an arbitrary number until your machine is re-started.

    No shinnanigans save for istat being selective!
     
  8. bozz2006 thread starter macrumors 68030

    bozz2006

    Joined:
    Aug 24, 2007
    Location:
    Minnesota

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