Powerspec g758 not happy

Hello I just picked up my power spec g758...if u look at there pictures on there site of pc it shows a cooler master aio..I got some off brand white elite brand aio....also my PSU is hooked up with 3 8 pin power cables.....in the picture it shows a 600 watt single Cable going to gpu not 3 8 pins power cables...anyone else have this pc with these parts?