How well does fast sync work?

[velzelvul]

Does anybody here have a 10 series gpu with a 60 Hz panel?
I know it sounds ridiculous but still... anyone?
Can you tell me if fast sync technology does any good for such panels - I want to get a 1070 and like a half of my reasoning for doing so is that it has fast sync technology so that I wouldn't have to upgrade still quite new 1440 @60 Hz Dell panel.

 

[velzelvul]

I just have to suck it up :/
At least I'm not alone - a lot of people complain about this stuff.