why DI still bump so much vcore???

oic... o thought if temp reach subzero then the vcore oso no nid so much, coz last time forgot wher the heck i read that the fella use phase cooling, n he uses much lower vcore to reach high fsb (lower vcore compare to wc or air cooling)... hmmm, 4.4GHz quad core... cool... maybe if he uses phase/cascade cooling like extremeocer doing, he can actually maintain it at 4.4ghz... hehehehe... btw, 1 stupid question... can xp support/utilise quad core??? i mean xp pro 32-bit...