If you have a plan to upgrade your Graphics card its may required upgrading of other components of your system such as Central Processing Unit (CPU), memory, hard drive or hard disk as well as power supply depending on the of application and a type of video card you will plan to use. Actually, those components to be upgraded need the precise requirements of power to support for there running.
Facts about Weak Graphics card slows down Personal Computer performance!!!
If you are running 3D animation and other heavy Graphics like most of the newest 3D Online games on your system, most of them depends on the Graphics card. Weak video card will slow down Personal Computer (PC) performance even if you have a strong Central Processing Unit(CPU) or a massive board memory module. Other components may support your system, but the quality of video output is loaded base on the Graphics card ability to handle the technologies. Actually some high-ends video card are more expensive than any other components of your system.