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A power supply unit is essential for making sure a system performs well at all times. It is one of the first system components to cause failure, which means that computer owners should make sure they opt for a high-quality, reliable power supply.

Power supplies are available in a wide range of wattages. To determine the right wattage, consult the owner's manual of the system or use a PSU calculator. The number and types of connectors are other things to take into account when buying a power supply. Common choices include 20- and 24-pin connectors. The main types of power supplies available on the market include bench power supplies, variable power supplies, lab power supplies, and modular power supplies.