News Ryzen 9000 CPUs drop 10% frequency executing AVX-512 instructions — Intel CPUs typically suffer from more substantial clock speed drops

[mitch074]

You're thinking of clock gating. That's different. The unit is still powered and maintains state, but it's just not burning as much power.


I think you're still telling fairy stories. Give us a source or it's not a "thing".

It's a theory, man ! I never said it's gospel ! But with a thousand plus temp sensor in a Zen chip, the fact that AVX512 is a very wide unit (it's 512 bits wide), it would stand to reason it would create a very localised hot spot if particularly hammered, one of the sensors picking up on it, and causing a clock speed dip. I don't see that happening with, say, the FPU - not as wide, and I'm pretty sure that, hot spot or not, the AVX512 won't gulp as much power as the rest of the CPU put together.

 

[bit_user]

It's a theory, man ! I never said it's gospel !

In my opinion, it's fine to speculate. I do it all the time. However, I try to be very clear when I'm just guessing or imagining vs. having read from a source I consider reputable. I would please ask that others do the same.

Sorry, if I've come across harshly. I do like most of your posts. Thanks for contributing.
: )