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G5 1.8 upgrade to G5 2.3

Discussion in 'PowerPC Macs' started by iceclimber1967, Feb 26, 2008.

  1. macrumors newbie

    #1
    Hello all!! I just bought a G5 mac tower with dual 1.8s. I also purchased a pair of 2.3s and the power supply from dual 2.3 as well. Can I just drop the new processors into the slots and have them work?? Is there anything I need to do to facilitate this upgrade?? Any help would be appreciated!!

    Jeff
     
  2. macrumors 6502

    #2
    You need the 2.3 motherboard... something about the G5 firmware locking you in. The bus speed is not adjustable, therefore the CPUs won't run at 2.3GHz.

    I recall someone trying to do this, but it threw off thermal calibration and put his fans at a constant full-blast, and the CPU speed wasn't what he hoped.
     
  3. macrumors newbie

    #3
    Thanks for the heads up, Aibo
     
  4. macrumors 6502a

    Lord Zedd

    #4
    He is right, this isn't like the old G4 where you could throw in a new CPU card and everything would be fine and dandy. The G5 CPU is tied to the motherboard now. Even if you remove the CPUs and don't put them back the same (You put CPU1 in slot 2 and CPU2 in slot 1 for example or replace one of the CPUs with a different one) you must use an Apple Service Diagnostic CD to recalibrate the thermal controls.

    There will likely never be a CPU upgrade for the G5, you're stuck with swapping a bunch of parts between different chassis.

    Basically, if you want a 2.3 you're better off selling your 1.8 and buying a complete 2.3 than swapping parts.
     

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