My power supply (Thermaltake Toughpower Grand 1050W) has native and modular cables.Two of the three native cables are an 8 pin EPS 12v CPU, and a 4+4 pin ATX/EPS 12v CPU. Will I ever have to use both of these or is it one or the other depending on what motherboard you have? I have an Asus P8Z77-V Pro/Thunderbolt motherboard. I see a connector on it for the 8 pin cable but not for the 4+4 cable. Do some motherboards use the 4+4 instead?