Thanks for the Tips. With hugepages enabled and 12 threads Im getting some more H/s. But I still have a huge difference between the two identical servers. Both running the same command. And htop shows 99-100% CPU utilization in both servers.... Very strange....

EDIT:
With 12 cores and hugepages enabled, the difference is even bigger:

Server1:
[2020-04-14 11:07:12.505] speed 10s/60s/15m 1655.8 1657.6 1654.0 H/s max 2204.9 H/s

Server2:
[2020-04-14 11:05:46.498] speed 10s/60s/15m 6188.6 6223.6 6235.3 H/s max 6273.5 H/s

Any idea what I can check? As said, both servers are showing 12 cores at 100% cpu utilization. (htop)