It's interesting that Zen5's FPUs running in full 512bit wide mode doesn't actually seem to cause any trouble, but that lighting up the load store units does. I don't know enough about hardware-level design to know if this would be "expected".<p>The fully investigation in this article is really interesting, but the TL;DR is: Light up enough of the core, and frequencies will have to drop to maintain power envelope. The transition period is done very smartly, but it still exists - but as opposed to the old intel avx512 cores that got endless (deserved?) bad press for their transition behavior, this is more or less seamless.