What clock generator does the X20/21 use?

[bhtooefr]

I've got a ThinkPad X21, and I'd like to try some night overclocking (too hot during the day to try it).

It's got a 700MHz P3. I underclock during the day, but I'd like to make up for it by overclocking at night.

If I knew what clock generator it used, I could overclock it some - seeing as it's got a ZXM (mobile version of a budget version of the legendary BX) chipset and the module I've got in the SODIMM slot is a Kingston module (even though it says it's a Kahlon.com module on it...), it should be decent enough quality to take an overclock.

931MHz (7 * 133) wouldn't be bad at all, now, would it?

Alternately, if I could get it to hit 665 (5 * 133) at reduced voltage, that wouldn't be bad at all. That could even be a daytime speed...