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Finding the exact wattage of your Power Supply Unit (PSU) purely through Windows 11 software is impossible because the PSU does not send its wattage rating data to the motherboard; it only distributes power.
If you are using a pre-built computer from a major manufacturer (like Dell, HP, Lenovo, or ASUS) and have not modified it, you can find the PSU wattage on the manufacturer's website. how to check power supply wattage windows 11
You may need to remove the side panel of your PC case. The PSU is typically located at the very top or bottom of the chassis. Finding the exact wattage of your Power Supply