Overclock your Lombard

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The whole howto has already been written here, so I don't have to copy-paste it, just visit the page to get an idea of what you want to do to your processor card.
This is just a success report with some photos of the surgery.

So, here you go. I don't take any responsability if you miss it, but that's unlikely to happen as I'm sure you'll be over-concentrated ;-)
  • Rip your powerbook apart to extract the processor board. This is well explained on the upper cited page.
    • Play fair, unplug the AC adaptor, remove the battery, touch a grounded surface, and so on.
    • Open the keyboard, remove the heat dissipator, unplug the processor card.
Image of the processor card

  • I advise you remove the so-dimm Ram, too.
  • So, up to the soldering!
    I decided to overclock from 333MHz to 336, by changing the clock multiplier from 5x to 5.5x, for a few reasons:
    • I didn't want to overclock the bus, as I don't know how would the devices (PCI bus, video card, IDE bus) support it ;
    • I didn't want to go too far at once - try 366, try it for a few weeks, if it's stable I'll perhaps go to 400.
    • Changing the clock multiplier from 5 to 5.5x required resoldering a single resistor - the less I modify, the less I could break.
  • On the image to the right, you can see a friend of mine, Yann, resoldering a one-millimeter-long resistor. Yes, I really trust him ;-) He's for sure better than me at such things...
Yann resoldering the resistor

  • Well, the resistor was quite easy to remove, harder to put back in its new place doing a clean job. Finally we got it well put... Time to put back the card back in the laptop and reboot (don't forget the heat plate) !
  • Crossing folders we rebooted the computer, and, ouf, we didn't fuck it up :) Everything runs ok.
  • Some facts...
    • dnetc crunches rc5 keys (yes, I know it's over, that was just as a benchmark) at about 1.2 Mkeys/sec instead of 1.0 MKeys/s before;
    • glxgears, the opengl demo, went from 120 fps to 147;
    • Chromium-BSU needs more enemies on the screen to slow down, and its average framerate went from 25 to 33.
    • Divx movies up to 640x480 are now viewable (with a little framedrop, but that goes unnoticed unless you know it), was 512x384 before.
    • According to MRTG graphs, the average temperature is about the same as before.
cpuinfo output

Well, all in all, that seems to be a successful overclock, and as it doesn't heat up more than before, I'll probably try 400MHz in a few weeks. Going from 366 to 400 has the advantage of requiring resoldering a single resistor, once again - not too much hassle at once ;-)
Update: I overclocked the Lombard to 400MHz today (2002/10/26). Still runs fine (2003/07/15).

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Colin Leroy - this article is under the Free documentation licence.