Originally Posted by benk95
Long time lurker in the forums, first time poster. I am looking into setting up a direct contact tec cooler on my amd 1090t and have a few questions. I am already running an xspc rasa waterblock with a 360mm radiator and a 120mm radiator. With this setup I am limited by heat transfer between the cpu and the cpu block, so tec cooling seems like a good choice. My questions are what wattage tec would you recommend, and where should I purchase it from. Would i be able to use my current waterblock to cool the hot side of the tec? Also, would something like this http://www.mfjenterprises.com/Product.php?productid=MFJ-4230MV
work well as a power supply. The reason I want to use this psu is because it has variable voltage and since it is 5 inches wide should pretty easily fit into 5.25 in drive bays.
That power supply would work nicely. You'll want AT LEAST a 280 watt qmax peltier, though for best results you should go for something along the lines of 345watt qmax. For cooling the peltier, no your current water block isn't sufficient. For best results you'd need to have a custom one milled. Since that isn't an option for most people, you might be able to make due with an Apogee XT waterblock. The Apogee XT has a LOT of surface area, much much more than most lane based waterblocks. It's pins cover about a 55mm area, so it could, in theory, handle a 50mm peltier, or if you use a quarter inch copper hotplate you might be able to get away with cooling a 62mm peltier.
As for radiator area: You really want to keep the hotside as cool as possible, and a single 360 radiator normally has about 250 watts of cooling at a 10Celsius delta temp. A TEC moves heat from one side to the other as well as adding it's own. At 16 volts you're probably looking at around a 500watt heat load your rads have to cool, so you'll want at least 6.120mm radspace.
Mind you it is absolutely necessary to properly insulate your motherboard and water block if you're going to use peltiers. That means dielectric grease in the socket, painting the back of your mother board in liquid electrical tape, using kneaded art erasers around the peltier, and sealing the area around the kneaded eraser/peltier/waterblock with liquid electric tape.
Peltiers offer below ambient cooling and will usually reach the dew point while not at load, so this means you need to have the area around it sealed so moisture in the air can't come into contact with the cooled area.