Hey, for once am I the first to try something out?
I have done something like what koslov has suggested.
I'm using a surplus Thermotek solid state (TEC) chiller. Modified to run constantly. Now I dont have the best WB (designing one) or the greatest setup. But I have a water temp of 12.1C and a MBM temp of 24C at load. Cooling a AMD 2100+ at stock freq and voltage. My attempt at unlocking was not successful and I didn't want to take it all apart to try again.
Koslov has got the basic concept down correctly. But you won't find a 12V40A power supply for any rational amount of money. You might however be able to find a 36V or 48V power supply that could supply 7 to 10 A that could work. Just put the TEC's in series instead of parallel.
Here is a pic of a similar model to the one I got as surplus.
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