Vertical Synchronization (also called Vertical Sync or VSync) is the synchronization of your monitor and graphics card's abilities to draw a certain number of frames per second (or FPS) on the screen. This is referred to as the Refresh Rate, and is measured in frequency per second (Hz). Different monitors can achieve different refresh rates at various resolutions, for example some monitors provide 85Hz refresh rate at 1280x1024 – this means the screen is redrawing itself 85 times per second at this resolution. If Vertical Sync is enabled, your maximum FPS cannot exceed your monitor's refresh rate at your chosen resolution, and your FPS may in fact be reduced overall. If Vertical Sync is disabled, your FPS will improve, and it can now also exceed the refresh rate cap, however you may notice some screen "tearing" – the top portion of the screen being slightly out of alignment with the bottom. This causes no damage to your monitor, and in general it is strongly recommended that Vertical sync be disabled in all games to improve performance. Since almost every current game has the option to enable or disable VSync in the in-game settings, I recommend you tick the 'Application Controlled' box here, and manually set the VSync in each game. This prevents conflicts between games and the Forceware drivers. Note that if you insist on forcing VSync to On here, try enabling Triple Buffering to improve overall performance when VSync is enabled (See Triple Buffering below).