blurry line while playing

[Your Computer]

Actually, frames per second is misleading when it comes to your monitor. The game may be pulling over 100 FPS, but in the end you're only seeing whatever the refresh rate of your monitor is. Hence the screen tearing. Want a chance for the monitor to catch up to your graphics card? A better monitor is required. Want a chance for your graphics card to match your monitor? Vsync is required.