Has this been proven definitively, or is it a theory?
Good point, maybe should have worded that differently. I was lead to believe there had been tests done on Anandtech, and they found or suspected atleast that using 1.4v+ on VTT or FSB termination ran a risk of killing 45nm chips.

I know personally, and yes taking the different chipsets into account, I have never needed more that 1.4v VTT. That's with my Qx running up to 4.9+ghz

Maybe I'm wrong on that, but I was under the impression this was common knowledge.

RLM