Custom-Built Computers
A how to Guide
Power Supply Selection
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| CPU Processors | MotherBoard | Graphics Card |
| Memory | Sound Card | Case and CPU Coolers |
| Power Supply | Hard Drive/SSD | Other Advise |
A very important part of the computer system is the power supply. Selecting the correct power supply can mean good stable operation of the computer even under stressful loads.
Interface and Compatibility
Currently power supplies use the ATX style.
Power supplies must have enough power handling capacity to run the computer and all its components.
Power supplies must be of good quality to consistently handle the load.
(Power that is placed on them)
Calculating the power (watts) needed for computer is simple. Just add the power requirements for each of the components. The total amount of power (watts) is the MININUM amount of power needed to run your computer. You can get the power usage of each component from its specifications.
Example: This is a set of numbers selected randomly. You must find the power requirements from the specifications from each of the components. Always use the highest power requirement to simulate worse case conditions.
| Components | Power Usage (Watts) |
|---|---|
| Motherboard | 350 |
| CPU | 84 |
| Graphics Card | 400 |
| Fan | 12 |
| Hard Drive | 12 |
| Total | 858 Watts |
In this example our minimum requirement for power supply is 858 watts. It is always best practice to purchase a power supply that is MORE than the minimum requirement. You may want to add components at a later date. I would suggest going with a 1200 watt supply.
| Things to remember about power supplies. |
|---|
| Always select more power than you need. |
| The higher the power the larger the power supply. |
| Be sure you have enough room and ventilation in your case. |
And always Read the Reviews and Customer Q&A on the product you select. Knowledge is Power!
