Also, keep in mind that the higher the processor speed, the more expensive the desktop. In many cases, after owning a PC for a while, you may also have the ability to upgrade these processors, as needed. Another factor that affects the speed at which a computer carries out operations is the bus speed. The interface in which the computers processor communicates with part of the computer is called a data bus. Bits and bytes of information are continually being transferred using these buses.
Different processors transfer information at different rates.
A processor with a wider data bus can move more information more quickly. 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.