I have been OCing an E6600 to 3-3.2Ghz with no major dramas. I have 2G Corsair C5 RAM, GA965P-DS3 (rev3.3) mobo, and ASUS GTS 8800 640MB video card. C1E, EIST disabled, RGB at fast, memory ratio at 2, setting 9x333 or 8x400, voltage from 1.25-1.3375 depending.
OC is successful both on CPUz...