In July, a University of Michigan computer engineering professor put out a new idea for measuring the efficiency of a processor design. Todd Austin’s LEAN metric received both praise and skepticism, but even the critics understood the rationale: A lot of silicon is devoted to things that are not actually doing computing. For example, more than 95 percent of an Nvidia Blackwell GPU is designated for other tasks, Austin told IEEE Spectrum. It’s not like these parts aren’t doing important ...
