Troubleshooting G5 CPUs

Discussion in 'PowerPC Macs' started by Zeke D, Aug 5, 2012.

  1. Zeke D macrumors 6502a

    Zeke D

    Joined:
    Nov 18, 2011
    Location:
    Arizona
    #1
    Many of you know I am having trouble with my G5. I want to rule out the CPUs. What will happen if I put a pair of 1.8Ghz CPUs in there? I know the 2.0 runs at 1000Mhz, and the 1.8s run at 900Mhz FSB. Will the 1.8s still work , lowering the FSB of the system to 900Mhz? or will it just fry my logic board?
     
  2. Mengele macrumors member

    Joined:
    Aug 6, 2012
    #2
    It won't boot. G5 logicboards are CPU specific. Even just switching the existing CPUs A-B B-A will cause the cooling system to run at full speed all the time.
     
  3. bengi macrumors member

    Joined:
    Jul 21, 2011
    #3
    that's true because you then need to recalibrate the sensors. there's a specific software, which is a nightmare (it works 1 out of 5 CPUs).

    however the question is still valid, wht are PowerMac G5 logic boards considered CPU specific?

    Ben
     
  4. havokalien macrumors 6502a

    havokalien

    Joined:
    Apr 27, 2006
    Location:
    Kelso, Wa
    #4
    CPU motherboard

    The bus speed is set and is half the speed of the CPU. A faster CPU may work but not usually, and will not boot the other way. The ASD ( apple support disk ). 2.5.8 for 1.6 to dual 2.0.

    Good luck
     

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