Robotech - where did you measure the water-temp in the single-loop chilled setup? I had posted about this close to a year ago in the main forum, the idea being that the coolant SHOULD be hotter in that setup (thereby increasing delta-T of rad to ambient, make rad more efficient), except for the few inches of coolant-path between the hot-block and cold-block (which would include the CPU-block) which should have very cold coolant in it.
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