Tweaktown took 2 of Intel’s top processors, the Core 2 Extreme X6800 and E6700 turned the voltage up to 1.475V and pushed them as far as they could go.  The results are impressive, it has been a long while since CPU’s could be pushed this far.
“Core 2 is simply the answer to all our processor prayers. Not only does Core 2 show a good overclocking curve, even from these early samples we have, but the amount of heat generated per MHz over its default is less than half of what the Pentium 4 generated. Adding to that the reduction in the amount of wattage the processor needs to pull from the PSU to do its job results in a quieter and cooler system.”

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