dunno = don't know

Utnorris

P.S. My Q6600 with a vid of 1.27v goes to 3.6Ghz at 1.47v 100% OCCT stable 24/7. Temps max out at 60c under load using w/c. To get 4Ghz, most have reported they needed 1.6v and a good cooler, typically w/c. Q6600 has a FSB wall around 475Mhz, so getting 4Ghz is possible, but does require a lot more voltage. Also, your NB voltage will need to be increased to get stable OC's. Mine is at 1.48v, but from what I have read to get 4Ghz you need 1.6v on the NB.