Intel Corp (INTC)

[Bird of Prey]

Bob, you are.

Each instruction executed is an electrical signal transmitted accross a distance. Just like an extension cord will get warm if you try and push to much through it, the pathways on a chip heat up as more clockcycles get used.
Intel and AMD both include built in thermometers with the chips. there are several shareware and freeware programs that can access this (and the one on the MB too). Get one and you can see for yourself.

Also, the P4 hasn't been released in a multi cpu version yet. Intell doesn't want to cut into the 2.2 gig sales by allowing you to buy and setup dual 1.9's just yet!

The Bird of Prey