No idea.. though when I use evga's precision X software to monitor and overclock my 1080s I have it set to start up with Windows 10 and it never does. So I have to manually start the program after boot up and when it loads the fans take off hard for 2 secs and then the go back down to normal. This is with the fans normally at a dead stop as well.

So maybe it's something with the Nvidia drivers causing the fans to spike like that as I have never noticed it with older drivers though I've changed cards a lot and gone back and forth from custom to fe cards and back.

Also I normally use the slave bios which sets the fans to always on I step of off till it hits a certain load. So maybe it's something with the software conflicting with the custom fan curve I'm using.. who knows. I wasn't too concerned cause it only happends when I first launch the software and I'm going custom water cooling for them today anyways.

Also have you just set the fan to a custom curve or just set it to like 75 or whatever % and it holds that? Cause if it moves up and down from that then forsure there's an issue.