Max Overclock Speed: 1.42GHz PowerMac G4 MDD

Discussion in 'PowerPC Macs' started by tayloralmond, May 7, 2012.

  1. tayloralmond macrumors 6502

    Joined:
    Mar 26, 2009
    Location:
    Michigan, USA
    #1
    Hello All,

    I just picked up a dual 1.42GHz 7455B G4 processor that I'm looking to overclock and install in my FW800 MDD. What is the fastest stable speed you all think I can achieve? I've found a great guide (http://bitsandpieces.info/Multipliers.htm) that shows how to overclock the 7455B but it doesn't recommend a max stable speed. Thanks for the help everyone.
     
  2. Whargoul macrumors member

    Joined:
    Apr 27, 2012
    Location:
    Denver
    #2
    1.42 is the fastest its stable. To get any higher speeds you will need a 7457 or 7448 G4 CPU.
     
  3. eegg0923754 macrumors newbie

    Joined:
    Mar 15, 2012
    Location:
    Chicago, IL
    #3
    You can hit 1.5 GHz no problem. The next step up from that which I believe is 1.58 might require a voltage boost (which the guide you have also covers). You probably can't go any higher than that on stock cooling.
     
  4. tayloralmond thread starter macrumors 6502

    Joined:
    Mar 26, 2009
    Location:
    Michigan, USA
    #4
    That's exactly what I needed to know. Thanks a lot.
     
  5. tayloralmond, May 13, 2012
    Last edited: May 13, 2012

    tayloralmond thread starter macrumors 6502

    Joined:
    Mar 26, 2009
    Location:
    Michigan, USA
    #5
    I ended up overclocking to 1.58GHz and it's stable. I didn't even have to alter the voltage allotted to the processors. I've ran GeekBench to measure the speed increase and included a picture. This upgrade was well worth the money.

    EDIT: Scratch that, it crashed. I had to slow the clock down to 1.5GHz.
     

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