I'm a noob at building PC's and need some advice on the GPU power cables. I have a Corsair TX850M PSU, and don't get how I am supposed to provide 3 x 8 pin power connectors to the Rog Strix 3080 OC - I would like to get myself some custom braided cables but have no clue what I am supposed to get, or even if I might need a different PSU? The PSU is semi modular