How does the temperature inside of my case affect the performance of my power supply?
Power supplies can perform differently depending on the temperature at which they are operating at. When a power supply is rated for it's total output wattage, it is rated to do so at a particular temperature. Anything beyond this temperature may take away from the power supply's capability. A power supply that is rated to put out 550W at 25°C may only be able to put out 450W at 40°C. This difference is called the "de-rating curve" because the component's capability to perform curves downward as temperature rise, very much like what is illustrated in the below graph.
Room temperature is typically around 25°C, or 77°F. A normal operating temperature for a power supply is 40°C, or 104°F.
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