Choosing a computer power supply is a personal experience based on factors such as form factor, power output, connectors, and efficiency. It’s important to match the form factor of the power supply to the computer case and to choose a power supply with a slightly higher rating than needed. The mean time between failures (MTBF) rating and 80 PLUS® certification can also help ensure reliability and energy efficiency.
Choosing the best computer power supply is generally a personalized experience. There is no single power supply that is perfect for everyone. There are, however, several factors you may want to take into consideration. For example, you’ll want to choose a power supply that fits your computer, supplies an adequate amount of power, and has the right connectors for your computer’s components.
A computer power supply converts alternating current (AC) from a wall outlet into direct current (DC) needed to power the components inside a computer. It also reduces the voltage to an appropriate level for those components. Heat is generated during this conversion process, so most power supplies have fans to keep them cool. Quiet and fanless models are also available.
Power supplies come in a variety of different sizes and shapes called “form factors.” Make sure that the form factor of your computer’s power supply matches that of your computer case; otherwise it won’t fit. One of the more common types is the Advanced Technology Extended (ATX) form factor used in many desktop computers.
A computer power supply is rated in watts based on its maximum possible output. The amount of power a computer needs depends on its internal components. High-end graphics cards, powerful processors, and multiple hard drives will make a computer power hungry.
Manufacturers test their power supplies under different conditions, which can influence the rating. Cheap or generic power supplies have ratings that can be very inaccurate. It’s generally a good idea to buy a computer power supply with a slightly higher rating than you need. Power supplies are more efficient at higher loads, so buying one with a much higher rating than you need can waste electricity.
Another important factor is a computer power supply with the right number and types of connectors for your needs. Different motherboards, processors and expansion cards have different types of connectors. Some devices are also modular, which means that different types of connectors can be attached or removed from a power supply as needed.
A rating known as the mean time between failures (MTBF) can help you choose a more reliable computer power supply. In general, higher MBTF ratings are a sign of higher quality. A poor quality power supply can shorten the life of computer components.
If energy efficiency is important to you, consider an 80 PLUS® certified computer power supply. When energy is converted from AC to DC, some of the energy is lost as heat. 80 PLUS® certified products lose 20% or less energy during conversion under standard operating conditions, saving electricity.
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