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You have to be aware that higher end graphics card tend to let off more heat and use more power. Most of the time, you will probably need to plug in a cable from your PSU so that the graphics card will have enough power. Another thing is that most OEMs computers don't come with powerful enough PSUs that can handle such a powerful card like that. As a result, you find yourself needing to upgrade your PSU that supports a higher wattage the graphics card needs.
Another thing to keep in mind... some cheaper computers may not come with a PCI Express X16 slot, so you will be out of luck if you don't have one and you are stuck with the slower PCI graphics cards. In that case, you need to replace your motherboard or computer just so that you can upgrade your graphics card.
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