Why don't X54xx work in 1,1/2,1?

Discussion in 'Mac Pro' started by applereviewguy, May 27, 2014.

  1. applereviewguy macrumors regular

    Joined:
    Aug 22, 2011
    #1
    I just bought some X5365's (scored them in a lot of 10 processors for $100, about $70 worth of processors leftover), and I was wondering why the Harpertown chips don't work in our machines?
     
  2. NOTNlCE macrumors 6502a

    NOTNlCE

    Joined:
    Oct 11, 2013
    Location:
    DMV Area
    #2
    The issue is in the logic board. There has been extensive research (such as HERE) into why they do not work. The final conclusion was "it's an Apple incompatibility." The FSB, Chipset, and Socket is not the issue since Intel's 5100 chipset can technically use 54XX CPUs, there are E54XX CPUs with a 1333MHz FSB (which is the same as your X5365s) and both use Socket 771. So honestly, there is "no good reason," if you ask me. It's just a logic board incompatibility.
     
  3. Umbongo macrumors 601

    Umbongo

    Joined:
    Sep 14, 2006
    Location:
    England
    #3
    Needs a firmware update which will never exist.
     

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