Summary

8 IT Essentials: PC Harware and Software Companion Guidecase. As the air passes warm components, it absorbs heat and then exits the case. Thisprocess keeps the computer’s components from overheating.You must consider many factors when choosing a case:■■■The size of the motherboardThe number of external or internal drive locations, called baysAvailable spaceWhen choosing a computer case, consider the following:■■■■■■■Model type: There are two main case models. One type is for desktop PCs, and theother is for tower computers. The type of motherboard you choose determines the typeof case that can be used. The size and shape must match exactly.Size: If a computer has many components, it needs more room for airflow to keep thesystem cool.Available space: Desktop cases allow space conservation in tight areas, because themonitor can be placed on top of the unit. The design of the desktop case may limit thenumber and size of the components that can be added.Power supply: You must match the power rating and connection type of the powersupply to the type of motherboard you have chosen.Appearance: Some people don’t care how the case looks. Others do. You have manycase designs to choose from if you want an attractive case.Status display: What is going on inside the case can be very important. LED indicatorsthat are mounted on the front of the case can tell you if the system is receivingpower, when the hard drive is being used, and when the computer is on standby orsleeping.Vents: All cases have a vent on the power supply, and some have another vent on theback to help draw air into or out of the system. Some cases are designed with morevents in the event that the system needs a way to dissipate an unusual amount of heat.This situation may occur when many devices are installed close together in the case.In addition to providing protection from the environment, cases help prevent damage fromstatic electricity. Internal components of the computer are grounded by attachment to thecase.NoteYou should select a case that matches the physical dimensions of the power supply and motherboard.