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If you want to get a system running really cool, there's only one option: liquid nitrogen, as seen in the wings of the Foxconn stand at CeBIT.
Not so carefully does it: supercooling a motherboard in the heat of a CeBIT exhibition halls requires regular top-ups. Luckily liquid nitrogen is a very good insulator so a little spillage won't harm the electronics.
Finally the Foxconn staff get the machine to boot, with an expectation that it will reach "something over 5GHz".