frame can twist and bend, especially when the PC is on, the fragile electronic traces on the
motherboard could break, or the motherboard’s mountings could sli por break, grounding
the board to the case. For these reasons and many others, the rigidity and strength of the
case’s chassis is one of its key requirements. When evaluating a system case, assure your-
self that the chassis’ structural framework is constructed to protect the components
mounted to it.
The frame should be constructed from at least 18-gauge steel (16-gauge is even
better). Less expensive cases may use lighter gauge steel or even aluminum. There is
nothing wrong with a lighter metal or aluminum case, if the case is reinforced in key loca-
tions with heavier gauge steel, but be wary of bargain cases made of lightweight aluminum.
They are much too pliable and can flex too much when being moved or lifted and may
cause problems inside of the case. The few pounds you save by buying a lightweight case
made of lighter gauge metals are not worth the potential for problems that a bendable
case can cause.
Another consideration and key attribute of the case chassis is its design and layout.
Where the crossbeams are located in relationshi pto where the chassis mounts the mother-
board, power supply, disk drives, and other components could later pose a problem
when you are trying to repair or upgrade the PC.
Chapter 15: The System Case^343
Figure 15-3. The chassis of a desktop PC. Photo courtesy of Enlight Corporation