The face of data centers is changing. Power density demands continue to climb with new computing technologies, ever-growing user bases, and expanding networks. At the same time, efficiency concerns are top of mind for companies, regulatory bodies, and individuals the world over. Data center operators and engineers have approached the pursuit of more efficiency from many angles and have made strides. Although data centers worldwide still use more energy than some countries [1], the estimated overall share of global data center consumption hasn’t changed much since 2010 thanks to innovations from those in the industry [2].