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by merlyn 1598 days ago
Power in is directly heat out (that mechanical motion of fans twirling just isn't giving more than a rounding error).

You can only get so much cooling density. And loading up a rack can use a signifigant portion of cooling.

Its pretty easy now-a-days to get 18kW into a rack, which will require 5 tons of cooling. Ie. enough cooling to handle a 3,000 ft^2 house.