nMP PCIe Switch Diode very hot

Discussion in 'Mac Pro' started by armut, Aug 6, 2015.

  1. armut macrumors member

    Joined:
    Jul 9, 2014
    Location:
    Germany
    #1
    Hello people,

    I have a problem with my nMP.
    I recognized via iStat Menus that my PCIe Switch Diode is getting very hot.

    To lower this I did NVRAM- and PRAM-Reset but nothing changed.

    Do you know how to fix this or what the problem is?

    Thanks...
     
  2. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #2
    I don't have a nMP, but post the screen capture may help the others to give out better comment.

    Also, quite a few of these hardware monitoring softwares (including iStat) are not optimised for Mac Pro (both new and old), they may give out useless reading, or use confusing terms which makes you believe that the computer has problem. In fact, in most case, the computer is indeed perfectly normal.
     
  3. armut thread starter macrumors member

    Joined:
    Jul 9, 2014
    Location:
    Germany
    #3
    Thank you for your replay.

    Here is the screenshot.
    Now its a little bit lesser than before because the temperature was about 87°.

    I hope you can help me. I also have no Apple Protection Plan.
     

    Attached Files:

  4. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    I think now the others with the nMP may able to help you by comparing the numbers from their machine.

    Anyway, will the temperature drops if you manually set the fan speed to something like 1200RPM?
     
  5. armut thread starter macrumors member

    Joined:
    Jul 9, 2014
    Location:
    Germany
    #5
    The temperature is going down to 72° when I set the fan speed to 1900 RPM but I have also to say that we have about 35° outside...
     
  6. DeltaMac macrumors 604

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #6
    That's just one temp (out of many), and not something that should worry you...
    87 C is hot, but not dangerously so.
    Why do you think that's a problem?
    Are you having other troubles with your nMP?
     
  7. armut thread starter macrumors member

    Joined:
    Jul 9, 2014
    Location:
    Germany
    #7
    No, I do not have any problems but I recognized it because the PCIe Switch Diode was marked red.
     
  8. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #8
    IStat turn the numbers in red by their own logic, there is no real relationship between red number and abnormal.

    e.g. On cMP, there is a number called "Core X Relative to ProcHot". In fact, this number is the bigger the better, but iStat will turn it into red when it over certain level, which cause some users believe their very good Mac Pro is running hot.
     
  9. armut thread starter macrumors member

    Joined:
    Jul 9, 2014
    Location:
    Germany
  10. AppleDroid macrumors 6502a

    Joined:
    Apr 10, 2011
    Location:
    Illinois
    #10
    Was just going to add my system with d300s also reports much higher Pcie switch temps as well. Seems to be a common thing with stat and these machines.
     
  11. theSeb macrumors 604

    theSeb

    Joined:
    Aug 10, 2010
    Location:
    Poole, England
    #11
    Mine is currently at 73 Celsius with the fan on at the lowest speed. It seems to stay at around that point on my machine, looking at the history in iStat
     
  12. SoyCapitanSoyCapitan macrumors 68040

    SoyCapitanSoyCapitan

    Joined:
    Jul 4, 2015
    #12
    Ambient temperature. If your room is 20 degrees you should expect that chip to run around 68-75c depending on how much load it is under. For every degree the ambient temperature increases the Mac can't remove the same amount of heat, so it has to get hotter. Reduce the room temperature.
     
  13. filmak macrumors 6502a

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    Jun 21, 2012
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    between earth and heaven

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