Above the radiator, we installed a surge tank into which the warmed water could run. From there, liquid flows into the radiator below and to the first GPU cooler. This ensures a constant supply of water to both pumps. Running out of the GPU's coolers, the water then proceeds down through the smaller radiator where it's cooled a bit. It makes its way through the CPU and back into the surge tank.
What you see here is a vertically aligned 120mm fan that provides improved airflow over the graphics cards' backplates. This is actually necessary in spite of the water cooling, as our cooler does not include a full backplate cover, which would normally cool the voltage regulation circuitry.
You may be asking, "What about extra heat from the cards?” After all, each GTX 1080 dissipates 25-30W of waste heat not addressed by the water cooler. Fortunately, the fans we installed in the desk took care of that problem easily.
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