3.1 Chassis/Case

Most PCs are enclosed in a case. Some daring individual have used fish tanks filled with oil as an alternative silent case, but that is a bit unusual and comes with interesting challenges.

There are several key criteria that determine how good a case is:

• Rigidity. Although a computer does not usually need to support a lot of weight, a computer case should not be flimsy. This is because a flexing case can bend the components inside, include the motherboard.
• Tool-less. Many new computer cases have tool-less construction. This means the assembly of a computer can be done without many tools. The use of thumb-screws and other hand operated devices make this possible.
• Rolled edges. Most cases are made from metal sheets. As such, any unrolled edges can increase the chances of cuts and scraps. Upscale cases have rolled edges all around to protect hands and cables.
• Number of drive bays. Most people only need one internal drive bay for a hard disk drive, and one external drive bay for a CD/DVD drive. However, more serious configurations may require more drive bays for RAID (redundant array of inexpensive drives) and additional CD/DVD drives.
• Fan mounts. It is not the number, but the location that counts. Many components, including hard disk drives, are sensitive to heat. Running a computer at a higher temperature can significantly reduce the life of its components. It is important that the fans are positioned to improve air flow across the components (instead of over the components).
• Material. Aluminum is lighter, but it is more expensive. Most cases are made from sheets of steel.
• Motherboard tray. A motherboard tray makes it easy to slide out a motherboard with components installed. This is important for computers that are upgraded or modified frequently.