i ran 1.8v (in bios vor my vcore) and it ran fine ...my 3.0c wud post upto 300 fsb (4.5 Ghz) and prob. higher but i didnt try, and was stable at around 4.3 Ghz at 1.8v ...but when i set the vcore to 1.825v ...my system reboots. wots up with dat.