I play project cars 2 on 1440p with a 1080Ti. Frame rates are around 100 and Gsync helps smooth things. Racing games aren't so demanding and don't necessarily need full 144fps to look good. 144fps at that resolution would be outstanding but long as fps is above 85fps and Freesync is doing it's job, that would be pretty good too and smooth.
Check with Samsung if this monitor is Gsync compatible with Freesync via Displayport if went an Nvidia card.