Hhmm im very suprised that some of you are stable at such low vcores.
I run my e6600 on an asus commando, 9*400=3600 mhz with a 1.5v vcore.
I run 3gb of ddr800gskill and 1 gb geil (all matched ) at 5-5-5-15.
I'm also on swiftech watercooling. I idle about 40 and around 48-50 under load. Interestingly enough I can run stabily at 3.3ghz with a 1.325 vcore and i idle about 30 and on load less than 40.
I know I could push this further but the required vcore rises exponentially the higher I push the chip. FOr example to reach 3900mhz I need to push around 1.6 even with watercooling this is pushing the limits I feel comfortable with.
At 3.6 I can boot into windows at a 1.45 vcore, it also runs TAT stabily for 30 minutes or so. And TAT is probably more stressful than prime 95.
However if i run the cpu tests in either 3dmark05 and 3d mark 06 the system crashes. Have you guys used the cpu tests in 3d mark to test your overclock?