Well, while sysbench is a pretty lousy tool to measure hardware performance of different architectures it’s really great when doing these sorts of tests since the whole job is done inside the CPU’s caches so not influenced by memory bandwidth/latency and also scaling linearly with count of CPU cores (so you can compare --num-threads=1 with --num-threads=8 and if the latter number is not 8 times lower you know there’s something wrong)
I posted over there a simple script able to repeat @balbes150’s tests from last year that clearly showed back then that with multithreaded CPU loads clockspeeds further decrease. Should be just a matter of minutes to repeat…