A 3 Ghz P4 from 2005 way well blitz a Core-M from 2015 on certain single-threaded benchmarks. But if you're concerned about energy bills, emissions, fanless com

A 3 Ghz P4 from 2005 way well blitz a Core-M from 2015 on certain single-threaded benchmarks. But if you're concerned about energy bills, emissions, fanless computing or all day battery life then performance per watt matters even on x86-64 desktop environments. From the article: parallelism results in power savings. Multiple threads working in parallel on a page-rendering job allow the CPU to complete the entire page in the same amount of time while running at a lower frequency.