The processor directly affects overall computer performance, more than other components such as the sound card or power supply.

When selecting a processor, some important considerations include the number of cores, the clock speed of those cores, and the amount of cache memory.

The motherboard is the component that unifies the internal hardware. You will need to ensure that the processor, memory, and other computer parts are compatible with the motherboard.

Though the motherboard can affect system performance, it can be difficult to quantify how much of an impact it has. Several important considerations include, the maximum amount of memory supported, compatible processors, data interface standards, and expansion card slots.

Both the amount and speed of memory are quantifiable factors that directly affect computer performance. Generally, the more memory a computer has, the better it will be able to multitask. Faster memory can speed up tasks that require data to be frequently loaded and retrieved.

There are many different types of computer cases, from small portable ITX cases to larger E-ATX cases for servers and workstations.

When selecting a case, you should consider how and where the computer will be used. Also, determine if the case’s internal dimensions are adequate for the components that you plan to use.

Computer power supplies are components that connect to an electrical outlet and send power to the individual computer parts. When selecting a power supply, you will need to determine if can handle the total power requirement of all the components.

To do that, add up the power loads of all the internal components and ensure that the PSU can supply at least that much power. It is recommended that you choose a power supply well above that minimum for more flexibility.