Guys, dumb question.....

I got 6 x gtx 1070, 4 cards are powered with 2 pci-e Cables that have 2x8 pin each, and 2 cards are powered using single Cables with 1x8pin.
I guess my question is, is there any Power difference/problems if you connect more than 1 Graphics card with 1 single pci-e Cable?