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A PCI express graphics card is a necessary component of all computers. It allows you to view things on your monitor. A PCI express graphics card is an absolutely necessary component for gamers since it allows them to play games that demand a lot of video power.If you use PCI express graphics card for intense gaming, then soon you will realize you need to change graphics card quite often. This is because new PCI express graphics card come out every few months and you will need the latest card to play the latest games. With some many PCI express graphics card out there, how do you decide which one is best for you?The two companies that produce PCI express graphics cards are Nvidia and ATI. Both are reputable and are in direct competition with each other.Even though there are only two major companies that produce PCI express graphics card gpu, each company produces many different models. To find out which PCI express graphics card suits you, you can visit Tomshardware which has a section dedicated to PCI express graphics cards. They provide to you a list of these graphics cards in order from fastest to slowest.There are many points you should consider before you buy a PCI express graphics card. For example, the fastest PCI express graphics card will obviously cost the most but the speed is probably very close to the next card down and the next card down would only cost half as much. So in that case, you might be better off going for a PCI express graphics card that does not cost the most but still delivers a punch.Experts recommend buying a PCI express graphics card in the $100 range. That way, you get a graphics card powerful enough to play most of the games of today and yet not too expensive. The most expensive graphics cards can cost over a thousand dollars.When you buy a PCI express graphics card, be sure to pay attention to the manufacturer who makes the card. Some manufacturers produce good qualify cards while others produce bad quality cards. Bad quality cards tend to overheat or just plain fall apart after awhile.There are a few websites that sell PCI express graphics cards that you can go to. Make sure you check out the seller ratings to determine if they are reputable or not.