antec truepower tp 750 and nvidia gtx 1080. Are they compatible?

Is this your power supply? http://www.hardwaresecrets.com/antec-truepower-new-750-w-tp-750-power-supply-review/

The non-modular cables should include 2x 6+2 pin PCI-E cables, you can see them in the middle of all the cables in the picture on that page. It also includes 2 modular PCI-E cables that are just 6-pin. You would need to use the non-modular cables.