Data centers consume approximately 2 percent of the nation’s electrical energy and roughly half of that is consumed by the IT equipment.  Berkeley Lab EETD researcher and lead author Henry Coles and co-author,  HPCS consultant Yong Qin from IT, recently published a paper where they evaluate server energy use and efficiency among commercially available servers that appear to be similar in design and performance, but were different as a function of server brand. The energy use and performance measurement methods presented in this report can assist those specifying IT equipment to select models and configurations that have superior energy use efficiency.  Coles and Qin will be presenting their results today at the 2014 Data Center Efficiency Summit held in Santa Clara, CA.