Be sure to look for the ENERGY STAR when shopping for an enterprise server
Current Specification Effective Date: June 17, 2019
The ENERGY STAR certified computer server product criteria requires that computer servers use more efficient power supplies, advanced power management features, real-time performance measurement, and lower energy consumption in both the active and idle states.
The criteria are tailored to each product type, including the number of processors and server type. In addition the idle energy consumption is reported and power management requirements exist. Power management is a key component of ENERGY STAR servers and should not be disabled to get the full energy efficiency value of the product.
For a complete description of the specification, please go to Computer Servers Version 3.0 Program Requirements (PDF, 849 KB)