But we have a practical system in mind which plays 24h a day chess.
Well if you're working on the worlds' strongest Go machine that will beat a
pro player, you might consider putting some Peltier-elements on the FPGA's
and use water cooling to remove the heat. Peltier elements are solid-state
and go to minus 20 or even -40 C. The investment for that would be
insignificant compared to the rest of the hardware, software and time, and
the payoff could be a system that runs 50% or 70% faster, *especially* under
the conditions you sketched.
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