How Can I Find Out My Psu Wattage Jun 2026

“Model: ATX-600W” might actually only deliver 450W on the +12V rail. Always trust the +12V wattage first.

Finding out your PSU (Power Supply Unit) wattage can be a straightforward process if you have the right information or tools. Here are several methods to determine the wattage of your PSU: how can i find out my psu wattage

Since Windows or macOS won't tell you the PSU size, you can use a tool like or OCCT to see how much power your components are currently drawing. While this doesn't tell you the PSU's capacity , if your components are pulling 400W, you know your PSU is at least 400W. “Model: ATX-600W” might actually only deliver 450W on

I can then give you a target wattage range for your specific setup. Here are several methods to determine the wattage

If you can’t open your case, you can reverse-engineer the answer by calculating your PC’s power needs based on its parts.

Some PSUs have visible indicators from the back of the PC (where the power cord goes). Look at the AC input socket:

Software cannot "read" the physical capacity of your PSU because there is no data connection between the power cable and the motherboard on most units. However, you can use software to estimate what your system requires, which helps you narrow down what you likely have.