The PSU itself has a sticker listing its wattage (not peak). You must open your PC case.
If your case is sealed or hard to open, you can find the wattage through documentation or external measurement. How to Check Power Supply Wattage on PC - ESGAMING how to check your power supply wattage
: Remove the side panel (usually held by two screws). The PSU itself has a sticker listing its wattage (not peak)
To find the wattage, you must either physically inspect the unit or use indirect estimation methods. 1. The Most Accurate Way: Physically Check the Label how to check your power supply wattage