Do you have the manual still for the computer? What you will most likely need to do is change some jumpers on the the motherboard. A p133 should be 66Mhz by 2x. There may also be a screen printing on the motherboard showing the jumper settings.
If the 60 is as high as the chart goes looks like you'll be stuck at a 120 as the max. I have heard of several people underclocking the chips, but I personaly would not try that.
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