I've got my board VDroop modded, and have slapped a Northpole cooler on me NB, but my Northwood tops out at about 4.5, and I blew up my Prescott a while ago and am not going to pay out for a good clocker again. I only got 10 Mhz more FSB out of my chip after the NB sink had cured, but the system seems a fair bit more stable.