I've tried to overclock some CPU's from AMD:
AMD K6-2 333 is not going up (motherboard EPOX MVP3 E)neither from 95 MHz bus or multiplier;AMD K6-2 350 is very good for overclocking up to 400 Mhz (100 Mhz x 4) on 3 tipes of EPOX motherboards (MVP3 M, E, G)- I have one which have 6 months of overclocking 24 hours on a day ; AMD K6-2 400 has disapointed me - it's very unstable on any try I've made, but I' still working...