Adding a third-party graphic card is a great way to improve your computers performance. For gamers, having a good card with enough memory and processing power will prevent your games from lagging and allow you to play a wider range of games. Cheap graphic cards will give you extra ports and may allow you to view games and movies in high-definition. The best graphic cards you can buy will allow you to split your screen between two monitors, or even connect your computer to your TV. In this way, you can watch DVD movies or stream YouTube videos to watch on a large screen.