Hello , so the tittle is kind of the main subject.If an rx 570 has 20 MH/s (correct me if i am wrong please) 4 rx 570's on crossfire should have 80 MH/s right ? Also on more question , if a motherboard sais it has 4 way crossfire it means i can put 4 amd graphics cards right ? Thanks a lot everyone have a nice day.