Common wisdom on the internet proclaims you must use two separate power cables when attaching two 6- or 8-pin power connectors to a graphics card. According to some, using just one cable is a danger.
Corsair has introduced the PCIe 5.0 12VHPWR PSU Individually Sleeved Cable series for use with compatible graphics cards. The cable comes in four color variations, namely black/white, black/red, black ...