Re: E6600 @ 3.4
My E6600 is 100% stable @ 3.6 (400x9), 1.4875v. Mid to high 40s running dual F@H or dual 32m SuperPi. The longest I've left Orthos run is a shade over six hours and max temps were 55c/56c.
At 3.2 (400x8) it runs on stock voltage and during dual F@H or SuperPi it maxes out at 41c/42c. It would make sense to just run at at this speed, but I don't see it as gaining 800 mhz, but more like losing 400!
BTW, this on water with a naked CPU (ihs removed).