I'm pretty sure my Corsair RMi850w modular PSU only came with a 1x 8-pin to 2x 6+2-pin cable to connect to my GPU (EVGA 980ti FTW), the GPU requires 2x 8-pin connections so will that 1x cable be enough? I would have thought a decent PSU like that would have come with 2x simple 8-pin to 8-pin plugs.