Question GTX 1070 G1 Gaming - power

Here are photos of my PSU and the cables I have available to me with the non-modular PSU inside a Dell Precision Tower 5810. As you can see, for some reason the 8pin is missing 2 and also has different shapes than normal 8 pins:

View: https://imgur.com/32gdNNI

View: https://imgur.com/iCoKnNZ

View: https://imgur.com/n2AZCOF

View: https://imgur.com/ABZMfXL

View: https://imgur.com/S9hsNDk


I have enough space for the EVGA GTX 1080 SC but am confused/worried about power.