To determine the power supply you need, you can use a power supply calculator tool such as the ones provided by Newegg, Cooler Master, or MSI. These tools will help you select a suitable power supply unit for your system based on the components you plan to use.
Another rule of thumb is to follow the 80% rule, which means that your parts should only ever take up 80% of the total power supplied by the PSU. For example, if you have a 350W build, you should choose a power supply that can provide at least 437.5W (350W / 0.8) of power.
Its important to note that a power supply only draws as much power as is needed to power the computer components. So, if your PC hardware is only using 200W, your 500W power supply wont draw 500W. However, its still important to choose a power supply that can provide enough power for your components to avoid any stability issues or damage to your hardware.
