1. Performance-per-watt is the new metric when it comes to buying servers
All of the server vendors mentioned by survey respondents undefined Dell, Fujitsu, HP and IBM undefined are designing their products for max efficiency. That means everything from the chipset to fans to power supplies to airflow. One tip from the experts: if you're buying an energy efficient server, make sure your utilization rate is high, so you take full advantage of the server's capabilities.