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AVX2 had no such problems in the first implementation of Haswell.
The turbo modes of AVX2 were lower than any other mode, but this hasn't changed since then.
It's not that it was improved.
AVX512 market is largely covered by other more parallelized hardware like GPUs.
Intel added 4 special instructions regarding AI called DLBoost in next generation Cascade Lake server CPUs as a superset of AVX512, but we all know that AI and ML/DL is a market for GPUs.
The GP part of GPGPU is becoming more and more general and this is a trend that looks like is not going to stop for HPC and all the other aspects of AVX512 that could be useful.
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