Safe voltage for 3.0c?

Does anyone know what the max voltage I should pump into my 3.0c is? I'm water cooling and the temps are relatively low. Even with 1.8volts into this processor it never goes above 55c fully loaded. I've raised it from 3.5ghz to 3.67ghz stable with some more speed. I haven't o/c'd any more in almost a year and i got the bug again. What should I limit the volts to on this chip for long term use, although if it dies in a year i don't mind really lol.

at 1.8v i would be surprised if it lasted a week.

i would keep it under 1.675v actual at all times MAX if you want that cpu to last a year.

read up on S.N.D.S. here: http://www.ocforums.com/showthread.php?t=115166&highlight=sudden+northwood