IMO, it's too much even for C0 revision of CPU (i7 965, right?).
I had i7 920 C0 and it needed 1.34V max for 3600MHz UnCore and 1.44V for 4000MHz UnCore.
By Intel's specs max safe VTT is 1.35V, but by OC'ers' specs it's the voltage you feel comfortable with.
BTW, if you seek for the opinion, I wouldn't use more then 1.45V for 24/7.
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