Overview of PC Systems and Components
Introduction
One of the great strengths of the PC platform that has led to its overwhelming success in the marketplace is its modularity. Most PCs are made up of many different individual components, which can be mixed and matched in thousands of different configurations. This lets you customize the PC you either buy or build to meet your exact needs.


This section discusses some of the major components of a typical, modern PC. Some PCs have some of these combined into one physical unit, but inside, somewhere, you'll find most if not all of these pieces.
System Case
The box or outer shell that houses most of the computer, the system case is usually one of the most overlooked parts of the PC. While it may seem inconsequential, the case actually performs several important functions for your PC, including protection for the computer circuits, cooling, and system organization. In addition, the system case is normally purchased together with the system power supply, and must also be matched with the size, shape and electrical requirements of your motherboard. Therefore, it has an impact on your options with these important components as well.


System Case
The system case, sometimes called the chassis or enclosure, is the metal and plastic box that houses the main components of the computer. Most people don't consider it a very important part of the computer (perhaps in the same way they wouldn't consider their own skin a very important body organ). While the case isn't as critical to the system as some other computer components (like the processor or hard disk), it has several important roles to play in the functioning of a properly-designed and well-built computer.





The case doesn't appear to perform any function at all, at first glance. However, this isn't true; the case is in fact much more than just a box. The case has a role to play in several important areas:
Structure: The motherboard mounts into the case, and all the