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The Sparkle I use 550 is rated at 32 Amps, and is also powering the rest of the hardware in the computer.
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You cannot achieve the full 32A from the 12V rail if you are running the rest of your system from the same PSU.
There is only a single 12V rail in computer PSUs. Multiple wires from the same point do not constitue multiple rails.
To run your 2x80W + 226W at 12V you will need 32A. This is irrespective of how much heat they can transfer. They still consume said electrical wattage.
So, computer PSUs are a good beat to run TECs at the moment.
I'm working on a 700W 12V supply. I'm investigating all the different ways I can realise such large currents. The supply will be water-cooled in itself. When its all done I will post the schematic so everybody can make one.