Ive got an Aerocool 750W Integrator Mod XT Semi Modular PSU that has a cable with two 6+2 pcie connectors on it I've been using a RX580 which requires 14pins and that's been working fine however I'm hopefully switching to a RTX 3080 and I'm wondering if the 2 connectors being on the same cable will cause a problem or should connect the other PCIE cable aswell