Mobo  B250 Mining Expert
Cpu Pentium G446
Ram 8gb
Ssd 120gb
Psu  2x Xigmatek 1200w
Gpu 12x gtx1070
Sata powered risers

I can't make it work. I can see all cards in device manager but sometimes 6 cards with a error 43 and sometimes even 11 of them error 43.  All cards tried separately and all ok. I add another 1600w psu now running wit 3 psu but problem still same.

 try to install Nvidia dirvers but after checking system compatibility its  just crashes but when I try with 8 cards its updating without problem