Speed Control: Overclock the PowerMac

Discussion in 'PowerPC Macs' started by froggytreafrogg, Aug 16, 2008.

  1. macrumors regular

    froggytreafrogg

    Joined:
    Jun 1, 2008
    Location:
    Louisiana
    #1
    Hello, I recently finished building my B&W PowerMac G3. I looked across the motherboard but took a closer look at the "warrantee void if seal is broken" sticker. I looked near the white bar that the sticker was covering and saw printed on the motherboard that it is like a speed control: called "speed/clt." I was wondering what this is and if it can overclock the speed of my processor to make it faster. :apple:
     
  2. macrumors 68000

    Hrududu

    Joined:
    Jul 25, 2008
    Location:
    Wichita KS
    #2
    Thats exactly what it is. You pull of the jumper block and can up the processor speed by changing where jumpers are placed. On a B&W I've never gotten any more than 50MHz out of an overclock, and on a Beige not more than 350MHz out of a 333MHz to run stable. Give it a shot.

    http://drivejumper.com/ClockupG3/b&wclockup.html
     
  3. macrumors 65816

    SmurfBoxMasta

    #3
    After the warranty ran out, I managed to get my rev 2/350mhz B&W up to 500mhz.......but it is best if you try it in 50mhz steps, and check it for stability after each step. I remember being so thrilled at getting the extra speed for FREE :p

    Just as a precaution, I added a small fan on top of of the heatsink, just to be sure it didn't fry itself. I ran it that way for 2 years nottaneveraproblemo.
     
  4. thread starter macrumors regular

    froggytreafrogg

    Joined:
    Jun 1, 2008
    Location:
    Louisiana
    #4
    how important is it to have the fan. the heat sink doesn't have a fan: is it important to put one if i optomize the processor? Thanks
    PS: nice signature
     
  5. macrumors 65816

    Joined:
    Jan 9, 2008
    #5
    The PSU fan blows air over the CPU heatsink in the B&W G3 models, you don't need an extra fan, though I suppose it couldn't hurt. Not sure where you'd put one, though.
     
  6. thread starter macrumors regular

    froggytreafrogg

    Joined:
    Jun 1, 2008
    Location:
    Louisiana
    #6
    yeah, i see what you mean. i clocked it up to 450 (from 400) im scared to push it any harder.
     
  7. macrumors 65816

    Joined:
    Jan 9, 2008
    #7
    Don't worry, go for 500. You can't hurt the processor... it'll either fail to boot (no boot chime), freeze after a while or during startup, or run fine.

    You can't damage a CPU unless you overvolt it, which isn't possible on a B&W G3 without a soldering iron (you have to desolder a few resistors).
     

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