guys im using a 750 watts gpu for risers/mobo bla bla, and using a server psu 1200 watts for the gpus, but i dont know what else to do cause windows wont detect any card, installed w10 uefi hard drive as gpt, uptaded to creepas bios... but w10 wont detect any of my rx570, any suggestion?

as soon as i connect a riser the mobo wont display anything, even with integrated graphics