don't connect anything but the voltage bridges (L3 i believe?) to set it to 1.85v if your mainboard doesn't support voltage tweaks..
i'd only do a fsb o/c with a 750 and 800mhz duron, since it'll yield the best performance figures.
i have this duron 800 that i'm typing on now o/ced to ~1ghz (124mhz fsb/mem) on an ECS K7S5A...rock solid...1064 is a little awry, so...