> Does the clock speed permanently reduce as soon as you use a vector instruction? I would have thought that the clock speed goes back up once the temperature h

> Does the clock speed permanently reduce as soon as you use a vector instruction? I would have thought that the clock speed goes back up once the temperature has gone down. It's not about temperature, some instructions lower the clock speed as soon as they're processed, and for about 1 millisecond, by design. CPUs from a few years ago do it for all the cores in the socket, more modern ones only for the affected core IIRC. 1ms is a lot of time, your core just needs to be processing 1000QPS to have a permanently degraded system.