@regehr@mastodon.social Every serious study (both from independent researchers and from vendors themselves) that I've ever seen (and I'm up to 5 or so at this point), broadly, supports this, with some caveats. It's not "no difference", but for server/application cores, what differences there are typically somewhere in the single-digit %. You can always find pathological examples, but typically it's not that much. There is a real cost to x86s many warts but it's mostly in design/validation cost and toolchains.