At the beginning I started with difficulty 4000 (4K) then the pool brought me "Diff 40" and finally "Diff 20" .. what difficulties can I enter for my hardware ?
thanks to all, greetings ultimate64
All of that is outlined in the official support thread-
https://bitcointalksearch.org/topic/gekkoscience-2paccompac-bm1384-stickminer-official-support-thread-1764803
but since it is inherent in this pool, it is better to talk about it here
You don't need to enter any for your hardware, you just let the pool automatically adjust it.
so if the pool leads me to difficulty 15 I have to leave so ...
ok, thanks
And why would you do that? Do you actually understand what it is, these shares and difficulty for your miner?
It's to keep flow of shares constant, so pool communicates with you efficiently and your hashrate estimation is more accurate.