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Here's a 6.6Ghz overclock: http://www.custompcreview.com/news/intel-core-i7-3770k-overc... with liquid Nitrogen cooling.

So how much is it a room-temperature a physical limit, and how much an economic limit?

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We're not that far from the speed of light barrier. There's a fixed amount of time it takes for any information to get from one end of a chip to the other and back. Only shrinking the die will decrease that.

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