One CPU running much hotter than the other

Discussion in 'Mac Pro' started by IceMacMac, May 1, 2015.

  1. IceMacMac macrumors 6502

    Joined:
    Jun 6, 2010
    #1
    I have a 2009 with dual CPUs.

    My iStatMenus reports that the 'A' CPU is running at 126F
    While the B Tdiode runs at 102F

    This disparity seems to be pretty recent.

    Any suggestions?
     
  2. bax2003 macrumors 6502a

    bax2003

    Joined:
    Dec 25, 2011
    Location:
    Belgrade, Serbia
    #2
    Check CPU fan speeds and clean CPU heatsinks from any dust.
     
  3. IceMacMac thread starter macrumors 6502

    Joined:
    Jun 6, 2010
    #3
    The fan speeds appear to be identical...not running real fast. I did a lazy ass inspection and cleared some obvious dust. They were dirty but not crazy so.

    How much of a concern is this?
     
  4. bax2003 macrumors 6502a

    bax2003

    Joined:
    Dec 25, 2011
    Location:
    Belgrade, Serbia
    #4
    If booster fans for CPU A and B are 800-1100, then dust is not making much problems.
     
  5. AidenShaw, May 1, 2015
    Last edited: May 1, 2015

    AidenShaw macrumors P6

    AidenShaw

    Joined:
    Feb 8, 2003
    Location:
    The Peninsula
    #5
    Suggestion? Stopping running your temp app.

    Many EVGA video cards don't even spin up the fans until the core temp on the GPU is 60°. (That's 140° in colonial units.)

    One of your CPUs is cold. The other is colder. There is no problem.

    If they hit 80° (175° in colonial units) it's time to investigate.
     
  6. flowrider macrumors 601

    flowrider

    Joined:
    Nov 23, 2012
    #6
    Many threads on this subject. In a 4,1 or 5,1 Mac Pro, CPU A always runs hotter than CPU B due to it's location. Do a search and you'll see.

    Lou
     
  7. IceMacMac thread starter macrumors 6502

    Joined:
    Jun 6, 2010
    #7
    OK...I won't worry about it for now. Thanks all!
     

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