G#

"The 1990’s data center, with air conditioning pouring through a raised floor, and featuring a water-cooled mainframe at the center, had a PUE of 1.92 to 2. That means it consumed about twice as much power as the amount used in actual computing; cooling was the largest power consumer after computing itself. Today, modern data centers built by Microsoft, Google, Facebook, or Yahoo have reduced that ratio to somewhere between 1.22 and 1.07."