A closed-loop water cooling system on a personal computer can pump over 3 gallons per minute -- which is meaningless since the water is being reused just to transfer heat. Somebody who had a closed loop system like this might impress his friends by saying that "my computer is cooled by 4000 gallons of water a day." It doesn't mean that you have a swimming pool worth of water dedicated to cooling your PC. The NSA center is cooled by 1.7 million gallons, which is equivalent to 425 personal computers, which is not that impressive.
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