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Over the last 10 years, there has been considerable innovation in data center cooling. Large operators are now able to operate at Power Usage Efficiency of 1.10 to 1.20. This means that less than 20% of the power delivered to the facility is lost to power distribution and cooling. These days, very nearly all of the power  delivered to the facility, is delivered to the servers.     I would never say there is no more innovation coming in an but most of the ideas Ive been seeing recently in data center cooling designs are familiar.

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