High-quality memories have a better tolerance for higher CPU bus frequencies. The swap file is much slower than the regular memory, so it's very important to make the least number of accesses to it as possible. Most people only care about the 3D performance of video cards, and forget that there are other important factors as well. This is another item in which brand names are usually the best performers. Before you buy a new video card, make sure that it has a good image quality.
Some cards sacrifice the image quality a lot, in order to achieve greater scores.
Stay away from them. It's not easy to decide which components to buy for your new computer in case you don't have much hardware knowledge, but if you follow most of the advice described in this article, you can be sure that you'll end up with a good deal, because the 5 items described above are the most important ones in a computer's performance.