Couldn't connect 6 gpu

[ReisMining]

Hello. I am trying to connect 6 gpu but only 3 gpus look like working. Working slots are pcie 1 - pcie 2 - pcie 3.
when I try to connect a gpu to any of 4-5-6 slots, Windows says there is no gpu. Is there any solution to enable these slots?
I have z270 gaming m3 motherboard, rx 570 8gb

[Vaccinus]

try to look in the bios there should be an option to enable the possibility to have more gpu to be supported by your motherboard, look for 4g or "gen" something, if not then your motherboard can't see more than 3