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A user can purchase a new computer or upgrade the old one by buying some new components (and getting rid of, selling, etc. old parts.) By replacing major PC components, you can often increase its performance at a small cost and be able to play modern games at acceptable frame rates.

It's expedient to sell your old computer and buy a new one, only if you can get a fair price for your old hardware. And if you have time to replace your computer each year and a half. Besides, you'll have extra problems with selling your computer, backing up your data, and probably computerless periods when an old computer is already sold and a new one is not yet bought. So it's often better just to make a partial upgrade. The primary task in this case is to find the bottleneck(s) and upgrade as needed. Of course, you should upgrade a PC before it's too old and can increase performance by replacing a couple of its parts. If your computer gets too old (two-three years or more), it's easier to just sell it and buy a new one. Since this guide is intended for inexperienced users, we'll describe only major issues that appear when you choose and buy a graphics card. This material gives basic knowledge of modern graphics cards, but it still requires certain knowledge of the topic.
http://ixbtlabs.com/articles3/video/guide-p1.html

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