You have some incongruences on your post.
You refer cuda, but that is exclusive to nvidia.
About freesync, I believe that all Polaris cards have freesync but you also need a monitor that supports it. Then you have to enable it on the monitor itself plus at the driver level.
If the game does not have any setting refering freesync then you have to set it to disabled (well not sure on this last one).
After all this, the monitor will adjust itself to make it smoother and without that tearing of vsync off.
The Englishman