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The computer power supply contains other parts to keep it from having power problems. It is built with a fan. This to prevent overheating during start up or usage. Some power supplies like the Diablo 550-Watt PSU also include built-in voltage overload protection. Keep in mind a power supply is like any other part of a computer. Make sure it works well with other parts like the processor and the circuit board or your computer might not work at all.