I fit 16 1/16" channels and 15 1/16" fins in a 2x2 area and 12 6-32 tapped holes around the perimeter for the top and cold plate all inside a 2.5x2.5" area. There is no room for an O-ring, you need to seal it with silicone or something. without a load and way too much voltage(generating extra heat) I got the cold plate down to -35c I think it was. The water was easily 35c+ once I get ahold of a 12v power suppply that can handle it, Ill try it out again, but this time on my cpu.
when cooling this large of an area with that low of heat dencity, you need a thin base, and low fins and channels, I distributed the flow using the top.
Jon
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