I'm having problems running 13 cards on this board, can someone help? I have ubuntu 16.04 installed and when I run 13 cards I get " the system is running in low-graphics mode" and I cannot get into desktop. When I run just 6 cards it works fine. Should I try another OS? Or is there something else I need to do? I have molexs plugged into board. Running duel power 1300w and 1000w, rx570s.