Some modern, high-end power supplies feature a USB connection that plugs into your motherboard. These "digital" PSUs can report their status to software.
💡 Never judge a power supply solely by its wattage. A high-quality 600W unit from a reputable brand is significantly better and safer than a generic 800W unit found in a budget pre-built. Look for an "80 Plus" certification (Bronze, Silver, Gold, or Platinum) on the label to gauge its efficiency. how to check what power supply you have