You want a higher bus rate if you often work with graphics and play computer games. If you are just shopping for a good bargain, and will occasionally deal with graphics, you can settle for a lower bus rate without worrying about it effecting computer performance. Look at the chart below for the different processors and their bus rates. If you plan on having several programs in use at one time, and if you create large files, you need more workspace for overall efficiency. Nearly all computers allow owners to upgrade RAM space.
Video memory can be part of the motherboard or it can fit into expansion slots.
The more video memory you have, the sharper you may view images on your monitor. Video memory enhances the ability to view text, photographs, illustrations or even movies. Video memory and processing capabilities may be upgraded by adding new Video Processing boards to a computer's internal expansion slot. Some computers include video boards that allow you to connect a VCR, TV or Camcorder to input and output video images. If we considered RAM your working space on a desk, then the desk drawers would be the hard drive, where you store programs and data files.