Joel Hruska, ExtremeTech, The Final ISA showdown: Is ARM, x86, or MIPS intrinsicly more power efficient? here. No link to the paper?
One of the canards that’s regularly trotted out in discussions of ARM vs. x86 processors is the idea that ARM chips are intrinsically more power efficient thanks to fundamental differences in the ISA (instruction set architecture). A new research paper examines these claims using a variety of ARM cores as well as a Loongson MIPS microprocessor, Intel’s Atom and Sandy Bridge microarchitectures, and AMD’s Bobcat.