SatanLucifer :
SO, Does it mean I can use GTX 750 Ti to play all the games(like far cry 4, battlefield 4) at 40+fps as I have no intentions of upgrading my monitor
These FPS I will show you is playing on a 1080p monitor. So you will get a slight increase in FPS on your current monitor.
Arma 3 : 41 FPS - High settings.
BF4 : 36 FPS - Ultra settings.
Far Cry 3 : 40 FPS - High settings.
Metro LL : 50 FPS - Medium settings.
Seen as you are on a lower res for now, you will be able to play all these games on High settings, with 45+ FPS. You can easily get 55-60FPS if you change some settings.
The GTX 750ti wil be perfect for you.