Yeah, you'll need a 5 divisor to do 166mhz. That 333 board should have it, but it could be a jumper, or "renamed" in the bios.
Rather than actually calling the damn thing a "divisor", they give you a fsb switch that locks out your choices between 100-132, 133-165, 166-200.
3,4,5. Same thing, just much more useful.
P4's @ 3600Mhz ()wNz J00 4LL!!!!!!