My E6850 L722A. Stable at 4000mhz but thats all. Takes pretty high voltage to achieve stability. 1.675 in bios, 1.63 in windows, 1.61 loaded. First screen shot was at 1.65 in bios but failed orthos after a couple of hours. Had to up voltage to 1.675 for 8 hour orthos stability. Temps are under 60c loaded even at 1.675v.
Cooling with water. Since this CPU was so inexpensive, I am going to run at these voltages 24-7, since temps are reasonable.