Curious what cooling your using, have you checked to see if your throttling under load with HWiNFO64?
I went with air cooling on my 9900k, running AVX instructions on all cores, my CPU jumps to max temps and begins to throttle, luckily, I don’t use those instructions in my work.
Its worthwhile to check for throttling, dropping to base clock could mean losing 1ghz x 32 threads, which adds up with long workloads.