I run those exact components (minus the ti, mine are regular 1070s, but Asus ROG). I cable two GPU per PCI-e cable, then two risers per sata cable. I've had two rigs running like this for over a year. I was hesitant at first and checked the cables for heat frequently, and have never had an issue. I do power limit each card to 125 watts with nvidiaInspector.
The power supply only supports 5 GPU (and only cmes iwth 4 cables.. sucks). I want to have six cards in the rig (both the motherboard and frame support six cards). Not sure what to do.
Should I buy a cheap power supply for the motherboard and just run the six GPU alone off of the corsair?