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I was wondering why the colder a CPU is, the further you can overclock it...

And by colder I don't mean more watts of heat taken away from it at the same die temperature, I mean lower temperature at the same heat flow.

Well, one of the limiting factors of overclocking is square signal becoming insufficiently square. That's because of stray capacitance. But a capacitor alone can't round the edges of a square signal - it needs some resistance on where the signal is coming from.

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