considering that i havent the slightest clue about over/underclocking. i have an amd k6-2@351mhz.
it was (as of yesterday) running @ 301mhz. as i was messin around with the various jumpers in both the voltagages and the fsb settings i somehow dropped my k6 down to 151mhz! i of course changed this and finally found something better than i had (the 351mhz mark) and left it there.

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"I have taken all knowledge to be my province." -Sir Francis Bacon