second CPU reduce single-core performance?

Discussion in 'Mac Pro' started by Filin, May 4, 2017.

  1. Filin Contributor

    Filin

    Joined:
    Mar 7, 2010
    Location:
    Ukraine
    #1
    When I delided a pair of my X5680s, first I ran the system with a single installed CPU, did some tests and after that installed the second CPU and again did the tests.

    With one X5680 installed Geekbench single-core was around 3,100. When second X5680 was installed single-core reduced to 2,800.

    Does anyone know the reason for this strange fact?
     
  2. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #2
    It is normal for Geekbench and certain other applications too. Additional cores in a single CPU doesn't seem to hurt (i.e. moving from 4 to 6 cores for example), but going from a single CPU to a dual CPU can lower single threaded performance a little bit in certain cases.

    I have no idea why this happens, but I can at least assure you that it is expected.
     
  3. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #3

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