What is CPU PLL Voltage for? Please explain.

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Hi,
The February edition of "Custom PC" describes how to run your i7-920's at 3.8GHz on P6T Motherboards.

What I want to know is what is the CPU PLL Voltage setting for?

The article says to adjust it up to 1.9V and then goes on to recommend not going above 1.45V unless you have extremely good cooling.

Is this a mistake?
What is "extremely good cooling"? Water cooling?
I have a Noctua NH-U12P with both fans in push-pull. Is this good enough?

What voltage should I set it to?

Many thanks for any advice.
 
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