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You can google for TECs, Peltiers, solid state cooling, themo electric cooling and the like if you want some reviews.
I'm sure you could cool up to 4Ghz with a peltier, so long as you are able to cool off the hot side of the peliter reasonably well. They make them in all sizes from a dozen or so watts to several hundred watts, you just need to buy one that has a good enough capacity for your CPU, and then use watercooling or something sufficiently powerful for the hot side of it.
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