Honestly, I find it a bit sad that this is even an issue.
I recently acquired a GTX 1080 FTW Hybrid (upgraded from a Gigabyte GTX 980Ti XTREME GAMING) and I found it very loud, mainly because of the radiator fan which cannot go below 56% speed...
How is it possible that there's completely no control over it? Why isn't it running at lower RPM when idle?
I tried connecting the stock fan to a 4-pin header on my ASUS ROG MAXIMUS VII HERO ALPHA motherboard and controlling it through ASUS AI Suite 3, but if anything it only made things worse because the fan wouldn't go below 60% no matter what I did - so the only real option for me to get a quieter Hybrid GPU is buying an aftermarket, static pressure-oriented fan to slap it on the radiator and then connect it to my motherboard.
I've got to admit that I'm a bit disappointed as this is my first EVGA card and I've heard a lot of good things about them in the past.