Different CPU temps

Discussion in 'Mac Pro' started by Jordan1990, May 14, 2015.

  1. Jordan1990 macrumors member

    Joined:
    Jan 17, 2015
    #1
    I upgraded my 5,1 earlier in the week with some X5677's. The machine is running fine however ive noticed that the temps are not equal, i can understand 1 or 2 degress difference but earlier i put the machine under some load to test and CPU A got nearly 10 degress C hotter than CPU B. I then physically touched the heatsinks after powering off and sure enough CPU A heatsink was hot where as B was just warm.

    The only explanation i can come up with is that ive done the thermal paste wrong on A, i did the same pattern on each and thought i used pretty much the same amount. I did the pattern of paste as recommended in apples own technician guide but i must have messed it up. What do you guys normally do with regards to a pattern and amount? Im guessing im going to have to take it apart again and redo it.
     
  2. Raunien macrumors 6502

    Joined:
    Aug 3, 2011
    #2
    A 10 degree difference between CPU A and B is normal on dual CPU machines especially under load. You did nothing wrong and you do not have to reapply.
     
  3. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    The heatsink is hot means it's working. If you did it wrong, the heatsink will be cold (heat can't transfer from the CPU to the heatsink).
     
  4. TzunamiOSX macrumors regular

    Joined:
    Oct 4, 2009
    Location:
    Germany
    #5
    The warm air from CPU B blows though the cooler of CPU A. So CPU A is a bit warmer.
     
  5. Jordan1990 thread starter macrumors member

    Joined:
    Jan 17, 2015
    #6
    Thanks guys

    Very true, perhaps i didnt stop to think about it logically! I was just a bit concerned because as i said by actual touch it felt like a substantial difference in temp on the heatsinks.
     

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