UGN Security Forums UGN Security: Underground General CPU Die size

Would someone mind clerifying what a/the CPU Die is? or CPU Die size?
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the size of the hole burned into the motherboard when the CPU dies.

From what i get from what i found it has to do with heat sink testing. Its a model of a cpu made out of copper or some other material. I guess it would be cheaper to use this than an actualy cpu when performing heat tests, since it would be fried by the heat. I think the term comes from die cast molding. I guess they make them different sizes since processors come in different sizes.

http://www.overclockers.com/tips263/index02.asp

(first hit on google. although i should stop saying that or people will stop asking questions on the board.)