5.1 2009 Mac Pro IOH Heat Sink Temp

Discussion in 'Mac Pro' started by fastlanephil, Jan 13, 2015.

  1. fastlanephil macrumors 65816


    Nov 17, 2007
    This is a continuation of my thread concerning the Apple Hardware Test error code 4M0T/1/40000002:pCI-0.


    I installed iStat Menus and it shows the IOH HeatSink in Red with a reading of 149 degrees. I have read that this should be about 70 degrees.

    I'm thinking that it has to do with the dual hex core upgrade?

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