This weird 6 + 8 pin configuration on Asus GTX1080 strix - Graphics Cards - Linus Tech Tips
What PSU Does the 1080 Need | Robots.net
MSI GeForce GTX 1080 GAMING X PLUS 8G review (Page 7)
Would it be possible to run an old GTX 1080 using a single PCIE power cable that's split in two as seen in the picture below? Or will there be stability issues? :