With G-sync Off the game play is so smooth ( stuttering and tearing there but smooth game play with Fixed Refreshrate ) now with Gsync on ( when i do Gsync On i capped the fps below the monitor refresh rate say like 2-FPS below the screen refreshrate ) the game is ridiculous bad experience.its not smooth at all ( Stutter and visual tearing ).and this is not a smooth experience game play in G-sync option .so it need to be fixed .currently playing with Gsync off.
To be clear- other games I do not have this specific problem .
in my Nvdia control pannel i choose power management > maximum , v-sync > Off , Power Mode > High performance mode .
A correction : few days ago i wrote in forum that Gsync has been solve but i dodnt saw that in my nvidia control pannel the refreshrate was set to Fixed refreshrate and i change it to Gsync ola the problem is still exist i made a support ticket no response ,still waiting like 4 days .i know the dev are so busy ,wish every problem will be fixed .thank you
What happens if you turn vsync on in game or in your driver control panel in addition to gsync on?
The nvidia recommendation is to have both gsync+vsync in the drivers active fwiw, but some games are finicky and may need the in-game vsync instead.
You’ll know gsync is working if there’s no tearing when the fps is below your refresh rate (either capped below like you’re already doing or variable), and with no overt stuttering either.
Try it out. I can’t speak for gsync functionality in this game, but for me with freesync I do get some tearing in FH4 when vsync is also off. No stuttering or tearing when it’s on (and on my system the FPS has been fluctuating from the 50’s to the 70’s (capped at 72fps on a 75hz display).
and i change it to Gsync ola the problem is still exist 
i made a support ticket no response ,still waiting like 4 days .i know the dev are so busy ,wish every problem will be fixed .thank you