With the past problem you helped me thank you. The problem was made by the windows defender.

Now I have a new question.  

My rig contains 6 x sapphire rx 580 nitro + 8gb.
They are all modular bios and almost work perfectly.
Four cards are with Hynix memory and two with samsung memory.
Card with Hynix memory give 31.3 Mh / s and  with Samsung's 27.8 Mh/s.

Is it possible to set in the Claymore that these with Samsung memory give 31.3 Mh/s?  

Thank you!