Hi guys i have same motherboard z270-p with 5 rx 570 8gb &  1 rx 580 8gb
 ???my problem is that when i boot my rig with 5 cards without connecting riser in 2nd pciex16 slot i can go till desktop, but when i plug in the 6th card in 2nd pciex16 slot it keeps on restarting before i see windows screen or gives a blank screen.
I tried many bios combination from this thread please help will reward