i have a black ice extreme on my setup with a single 120mm fan with shroud. i believe that the tubes carrying the water are actually "flattened" in order to increase the surface area, and therefore the heat transfer. also , if you look at any auto rad, you'll see they all have fins to help increase that area. also, most good radiators are copper, or aluminum. although i believe that copper is the best. for the mathematically inclined, there's plenty of reference material out there that will help you size components if you're building your own rad.
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