Thermal and Power Specs:
94 = Maximum GPU Temperature (in C)
180 W = Graphics Card Power (W)
500 W = Recommended System Power (W)4
8-Pin = Supplementary Power Connector
Here is Guru3D's power supply recommendation:
GeForce GTX 1080 - On your average system the card we recommend a 600 Watts power supply unit.
GeForce GTX 1080 SLI - On your average system the cards we recommend a 800 Watts power supply unit.
If you are going to overclock your GPU or processor, then we do recommend you purchase something with some more stamina.