Re: 3.40 GHz Causing issues?
I bumped the voltage all the way up to 1.5V when I had an E6600 @3.6GHz. True, it showed as ~1.42V in Windows and went down to 1.36-1.38V under load. For 3.4, I think it was at least 1.4V.
You could also try changing fsb termination and northbridge voltage.