please help! only 3 out of 4 gpus detected

amd1361amd1361 Member Posts: 26
I really need your help guys as i am struggling to make my fourth gpu to be detected by my GIGABYTE F2A88X-UP4 FM2+.
I have put one of my gpus (sapphire rx 470 nitro) into pciex8 and the rest (using 1x to 16x risers)into pciex1-1,pciex1-2 and pciex1-3.
when i go to windows just 3 cards are detected and one of the pciex1 is not detected at all.(my gpus,mainboard and cables are 100% ok)
please help me. is there anything in the bios I can change to make the fourth one come to life.
here is the motherboard pic


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