I can't seem to figure out how to plug my R9 290 GPU into my Corsair CX series 750 watt Modular psu, I got some cables with the GU itself, 1 8 pin and 1 6 pin both splitting into 2 Molex connectors. In my modular psu, there are 6+2 pci-e, 4+4 cpu and the peripheral + sata ports. I don't know where to go from this and have been stuck for quite a long time now. I am a bit of a pc building noob and this is my first build, please help!