to make sure their is no parts mismatch I would recommend you put your chosen componants into the build my pc section of a company that builds custom pc's.
I have a gtx 1080 and when I did my parts list the companies build checker said
650 watt psu was ample and that was taking into account 10% more than needed to allow for any sudden demand.
I have yet to find anything that makes the 1080 get even warm , I got it 2 years ago when it first came out and now the prices have gone down a lot.
if you want to read about my build then type "my game breaker rig" into a browser and it will be at the top of the search engine