I am going to jump on this thread.
My machine ran ok with a 300 K6-2 2.2v/3.3v running at the stock 200 mhz.
I did the sw1 and sw4 (multiplier and bus if those are the wrong numbers) mod.
Still runs fine but the highest it will post is 266/274. The highest winME will boot is 233.
At 266 I can boot to C: prompt but winme crashes.
Lifted the 3rd pin of q16, put on the .13ohm 10w resistor in series.
Still will only boot at 233 and will only post up to 266/274 (only the two bus speeds)
BIOS shows the correct voltages. At the slower speeds windows runs just fine.
What am I missing?