Actually the 2x122W peltiers plus an Athlon would overpower the 2x172Ws leading to temperature rise. 2x122W is 244W moved, but actual hot side dissipation is more, then you have to add on the athlon, which is at least 100W. Conservatively you're looking at 350W into the 172's, not good considering they're only rated to 344W.
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