So I have 3x SATA cables/branches with 3x SATA connectors on each. I attached 2x GPUs (which are on 16x USB risers with molex connectors. These risers have molex to sata extenders ) per branch so I dont overload a single branch (3rd SATA connector on each branch is not attached to anything, except one on which I plugged the SSD with nvOC on it). One branch with molex connectors is plugged into the two molex slots on MB.