asrock Z77 extreme 9, PCI problem

[mrbugera2]

hello guys i need your help, i have a asrock z77 extreme 9, with 7 slots for video card, i have installed driver with one video card and then after turning on i have added 5 more, (all video cards sapphire rx480 6 of them) but in my pc in device manager it shows only 2of them, i have changed with other risers, other slots, so i figured out that on motherboard there are only 2 of slots working, working i mean that there must be some button in bios to enable all of pci slots help please.. here is the pic of which pci works

https://ibb.co/d7odRk

[mrbugera2]

i have already changed risers but no luck

[Neurolicious]

You must configure BIOS. Watch this video : https://www.youtube.com/watch?v=qoEfvYH1Db8
Maybe this helps you.

[mrbugera2]

thanks man, the problem was solved, the problem was solved by enabling 2gen speed