As a new user, at the beginning I greet everyone.
To the core: I built a mining rig:
-Asrock h81 pro btc r2.0
-6x riser usb
-evga 750w gold power
The problem I am struggling with is that there is only one gpu. The remaining 5 pieces are detected by the system, cards and risers smooth (I connected them in turn x16 and they all work without problems). I tried changing bios and nothing. All cards detected but unfortunately only one works under x16, it shows temp. Speed, etc., the other cards stuck under x1 do not show any parameters. I do not know - the problem is in hardware or software. Has anyone any idea to solve this problem. Regards