If you have to turn on vsync to get rid of tearing then gsync isn't working properly.Something I dont get..... the game sets the refresh rate and maximum fps.
So when I have gysnc turned on, I still experience screen tearing at 100hz.
This only dissapears with vsync on.
I thought the whole point of gsync was to not have vsync on?
This happened to me using freesync and the issue was multimonitors, try turning off all except your main display and it should work.