Energy Star Certified Servers are always a good idea

”Upgrade your servers to ENERGY STAR® qualified models. In recent tests conducted by the EPA, Hewlett-Packard, and Microsoft, new ENERGY STAR servers used 54 percent less power than some older models.”

https://www.nationalgridus.com/Long-Island-NY-Business/Energy-Saving-Tips/Tips-for-Data-Centers?fbclid=IwAR2kCtevwu0vJVTCRU7B576doJCeAVDX7g19PhlW9Mep48OuBoXos7K5kKQ