Are computer power supply ratings the input or output wattage

After looking at some of the draws of the typical desktop computer system I am confused by power supply ratings which seem to be excessive. The big item in a desktop computer, the CPU typically ha

Computer Power Supply Wattage

Power supply ATX 20 + 4 pins 300 Watts - FSP Group model FSP300-60ATV

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How to choose the best PC power supply

Make sure this fits by entering your model number. HP Power Supply 503376-001 240W Pro 6000/6005/6200 Elite 8000/8100/8200 HP SPS: 508151-001

HP 508151-001 Power supply - Input voltage 100-240VAC, 50/60Hz, 240 watts output, standard rating - For Small Form Factor (SFF) PC

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