X99 motherboard problem

[esparpiri]

ok so i bought a x99 motherboard to mine with a xeon cpu randomx and 6 gpu on other algorithm, the problem is that when i only manage to run 2 off them, but when i connect one more or the 6 gpu it boots fine but when reach the hive os miner the screen goes black and stays that way, i tried to change pcie to gen 2 and gen 1 and nothing, config all the bios settings that normal do the trick, in the pass when i have this error I connected the dvi cable to the motherboard and the problem was fix, but i cannot do the same because this motherboard does not have any support for IGPU, so… im stock any ideas? thanks