Thanks bill gator, you are right!
My post are not complete and i forgot to tell you more informations about it.
Anyway this card works fine and i used it for 3d modeling and sometimes for mining monero, whit mining speed about 1khash/h more or less.
I have to delete this post beacause i leased this card to a friend and so is not more available.
In all the case thanks for your tips
I try to improve my account