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Of all the components in a computer, your graphics card is usually the first to become obsolete. New graphics cards are released every year, each one boasting more power and features than the last, and the best gaming PCs are defined by the performance of their graphics card.
If your PC is more than a couple years old, and you've already upgraded to a solid-state drive (SSD) rather than a hard disk drive, upgrading your graphics card is likely the best way to improve your computer's performance.