AVX-512 instructions can significantly boost performance in multiple workloads, but the way these instructions were implemented in CPUs caused a significant frequency drop and increase in power consumption. Yet, how AVX-512 is implemented in AMD's Zen 5-based Ryzen 9000-series processors does not cause any considerable clock speed drop or a massive increase in power draw, as tested by InstLatX64.
As it turns out, AMD's Ryzen 9 9950X drops frequency by 10% with heavy AVX-512 usage: it reduces clock speed from 5,700 MHz to 5,300 MHz, which is not substantial and which is in line with what AMD said in an interview with Tom's Hardware back in July. In contrast, Intel processors that do support AVX-512 (the company is known for disabling AVX-512 from Alder Lake and Raptor Lake CPUs for various reasons) usually drop their clocks dramatically when executing AVX-512 instructions.
