Overclocking!!

Discussion in 'iMac' started by appledyl, Mar 13, 2010.

  1. appledyl macrumors regular

    appledyl

    Joined:
    Apr 20, 2009
    Location:
    USA
    #1
    How can i succesfully and efficiently overclock my iMAc g4? thanks. detailed answers appreciated. ;)
     
  2. Hellhammer Moderator

    Hellhammer

    Staff Member

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #2
    Macs don't have BIOS so overclocking is quite hard or maybe even impossible. Check out threads about it here
     
  3. DoFoT9 macrumors P6

    DoFoT9

    Joined:
    Jun 11, 2007
    Location:
    Singapore
    #4
    you would have to manually change the frequencies via soldering! goodluck with that one lol
     
  4. mike.coulter macrumors regular

    mike.coulter

    Joined:
    Jun 10, 2008
    Location:
    Cardiff
    #5
    I have an iMac G4 and it already has overheating problems... I really don't think I could suggest that you overclock it. Unless you open it all up and change the cooling system?
     
  5. 666sheep macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #6
    Above is for 167 Bus iMac (1.0 GHz+)
    Here is what you looking for.

    I OC'ed few 800 MHz iMacs and full succes was with only one. Only one of about 4-5, i don't remember now...
    One had KPs, one had overheating problems, one refused to boot with OC'ed CPU.

    Max stable was 900 MHz (100 MHz increase), max that i have reach with 800 was 1000 MHz (booted and KP after 5 mins - too hot).

    So decision is up to you.
     
  6. mrsir2009 macrumors 604

    mrsir2009

    Joined:
    Sep 17, 2009
    Location:
    Melbourne, Australia
  7. MacHamster68 macrumors 68040

    MacHamster68

    Joined:
    Sep 17, 2009
    #8
    i knew its for the 167mhz model only, but it was only meant as a hint how and for the problems it will cause , the cooling system is the worst part on the iMac g4 , while the eMac which has the same processors but the heatpipe and coolingsystem is over-engineered and keeps it cool, even overclocking from 800 to 1.33 is stable and works , where as the iMac starts cooking and freezing even at mild overclocking attempts , reason a very small heatsink compared to the eMac and the fan is not as efficient , but quiet

    so if the op urgently wants a faster iMac g4.... his best an safest bet is to get the 20" 1.25 model ,instead of trying to fry his iMac g4 :eek:
     
  8. 666sheep macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #9
    Hard to disagree with that :)

    Only one benefit of OC'ing this iMac could be native Leo support: no OF hack and other tweaks needed to install.
    ...and maybe a little improvement of OP's soldering skills and iMac anatomy ;)
     

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