Why should it be so hard to believe? A mainframe box is about the size of a rack of servers, and all the components are much more tightly integrated. Plus the u

Why should it be so hard to believe? A mainframe box is about the size of a rack of servers, and all the components are much more tightly integrated. Plus the utilisation on m/fs is much higher than on normal servers. I don't have benchmarks, but googling "mainframe energy efficiency" brings up a load of results, eg: https://www.bmc.com/blogs/mainframe-sustainability-green-it/ https://www.bmc.com/blogs/mainframe-sustainability-green-it/ https://www.serverwatch.com/guides/for-energy-savings-consider-a-mainframe/ https://www.serverwatch.com/guides/for-energy-savings-consid... https://www.suse.com/c/mainframe-versus-server-farm-comparison/ https://www.suse.com/c/mainframe-versus-server-farm-comparis...