Well, 55w peltiers are borderline. At 1200 mhz, your copper mine is putting out about 45w of heat It just might override the peltiers. Go w/ some peltier around the range of 70w.
Getting off the topic of peltiers, I'd get the new black radiator over at OCWC or a bigger Hayden radiator. The 4x4 Hayden radiator will probably be able to handle the two P3s okay, but adding peltiers would probably not be good for it.
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