First of all I have to give Kyle props for being the first website I saw with any information posted on this Prescott voltage issue. It apparently is one of the new features Intel is using to keep these beasts cool. The processor senses when it's getting too hot and lowers the voltage to help cool itself off. The heat production of these processors is simply insane. If they were to keep the processor at 1.525v all of the time it would take way better cooling than any OEM would ever put in their systems. We all heard enough about Intel's struggles to go to the 90nm process and the delay the prescott and other products saw because of this. I don't believe they really fixed the issues they were having. I believe they used a bandaid and shipped it out anyway! Of course I can't prove this but it's just what it smells like from here.
Intel's response to Kyles article:
"The author has confused Dynamic VID with voltage variations due to the VR Load Line and current draw. They state: " We have been monitoring a Prescott 2.8E voltage under normal usage and have found the voltage to fluctuate greatly" which is normal and expected. The voltage must increase/decrease as the current draw decreases/increases. They were not monitoring the VID pins which would have held steady at their factory set level. "
The most useful document I found on Intels website was entitled Intel Pentium 4 90nm thermal and mechanical design guidelines these quote .gifs are from it unless otherwise noted.
Have you noticed when you check out the specs for these prescott CPU's why it says