How To Tell What Power Supply You Have In Your Computer?

A power supply is an essential component of any computer, as it provides power to all the other components. However, sometimes it becomes necessary to determine what kind of power supply is installed in your computer. This can be helpful when planning to upgrade your system or troubleshoot any potential problems.

There are several ways to determine what power supply is in your computer, including checking the specifications of the computer or opening up the system and physically inspecting the power supply. By knowing how to tell what power supply you have in your computer, you can ensure that your system is running smoothly and efficiently. In this article, we will discuss the various methods you can use to identify your computer’s power supply and make the most informed decisions about upgrading or repairing your system.

How to Tell What Power Supply You Have in Your Computer?

To determine the power supply in your computer, follow these steps:

1. Open your computer case: Turn off your computer and unplug all cables. Then, use a screwdriver to remove the screws that hold the side panel in place, and carefully remove the panel.

2. Locate the power supply: The power supply is usually located at the back of the computer, near the top. It is a rectangular box with a fan on one end and a bundle of cables on the other end.

3. Check the power supply label: The label on the power supply will tell you its maximum power output, usually measured in watts (W). Look for a label that says “AC Input” or “Total Power,” and note the number after it.

4. Determine the type of power supply: There are two main types of power supplies: ATX and EPS. Look for a label that says “ATX” or “EPS” to determine which type you have.

5. Check the connectors: The power supply has several connectors that provide power to the various components in your computer. Look at the connectors and compare them to the ones on your motherboard, graphics card, and other components to determine if they match.

6. Use a power supply tester: If you’re still uncertain about the power supply in your computer, you can use a power supply tester to check its output. These devices measure the voltage and current output of the power supply and can help you determine if it is functioning properly.

By following these steps, you should be able to identify the power supply in your computer and ensure that it is providing the necessary power to all your components.


1. What is a power supply in a computer?
A power supply unit (PSU) is a hardware component that supplies power to the computer’s other components, such as the motherboard, CPU, and graphics card.

2. How can I tell what power supply I have in my computer?
You can usually find the power supply’s model number and wattage rating on a sticker located on the PSU itself. Alternatively, you can check the computer’s manual or use system information software to find this information.

3. What is the wattage of a typical computer power supply?
The wattage of a computer power supply can vary greatly depending on the components being powered. However, most modern desktop computers use power supplies with wattage ratings of around 500-750 watts.

4. What should I do if I need to replace my computer’s power supply?
If you need to replace your computer’s power supply, you should ensure that you choose a PSU with the same or higher wattage rating as the previous one. You should also make sure that the new power supply is compatible with your computer’s motherboard and other components.

5. Can I upgrade my computer’s power supply?
Yes, you can upgrade your computer’s power supply. Upgrading to a higher wattage PSU can provide more power for demanding components such as multiple graphics cards or high-performance CPUs. However, it is important to ensure that the new power supply is compatible with your computer’s other components before making any changes.


Now that you know the different ways to determine what power supply your computer has, you can confidently upgrade or replace it if needed. Remember to always check the wattage and compatibility with your computer before making any changes. A good power supply is crucial for the proper function and longevity of your computer, so don’t overlook its importance.

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