I think you would first off need a rad with quite an open fin design, larger the better. It needs to be oriented so that air flows up through the fins. Lastly it neeeds to be unobstructed access ,above and bellow, to room air with a clear column straight up to get some good convection. My thoughts would be to cantilever it off the side or back of the case, though if the comp is under a desk you loose the clear column of air above it.
Edward
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