It clearly says in the Intel documentation that if you go beyond the Absolute Maximum core voltage which is 1.45 volts for 45nm, that your "reliability will be severely degraded."

Even in the gray area of 1.40 to 1.45 volts where many people here operate their 45nm processors 24/7, Intel still states that, "neither functionality nor long-term reliability can be expected.

If you want to push 1.55 volts or whatever through a 45nm CPU that's fine but if a month or 6 months from now you find that your processor has degraded, you shouldn't be too surprised by that. The only surprising thing would be if your processor didn't degrade. I don't think the new E0 stepping is going to significantly change the laws of physics that limit these CPUs.

2.6 Voltage and Current Specification
2.6.1 Absolute Maximum and Minimum Ratings

At conditions exceeding absolute maximum and minimum ratings, neither functionality nor long-term reliability can be expected. Moreover, if a device is subjected to these conditions for any length of time then, when returned to conditions within the functional operating condition limits, it will either not function, or its reliability will be severely degraded.

http://download.intel.com/design/pro...hts/318732.pdf