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Thursday, March 23, 2023

What Power Supply Do I Have: How to Know About Your PSU Wattage

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We often get troubles and also get stuck when we are trying to resolve the problems regarding the power supply. Here’s is a guide if you find yourself in a similar place where you cannot identify your power supply’s model and its specifications.

Why do we need to check our PSU? Purposes like adding new components and overclocking the same components need some prior requisites and checking your PSU, its wattage, and ratings are essential in prerequisites.

Now another question that may arise in your mind, what is my PSU?



The most reliable method for one to check PSU on your PC is by opening your pc case and seeing the model and specifications of the power supply printed on the body or on a label on the PSU. You can also check the boxes in which your PSU comes in or the manual along with it.

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What PSU Do I Need?

You need to be well versed with which PSU would be sufficient enough for your PC. When people upgrade their PC one point they seem to neglect is the power supply supports the working of this upgradation.

So an upgrade means a higher wattage and higher rated power supply. Damage to the motherboard and other expensive components is inevitable if one keeps a low-quality power source. So, it is said to pick any PSU wisely.

Ways to check what power supply I have on my PC

A lot of us want to be aware of how our system is working, what is the power source, how much is the current supply? Often we get stuck with these questions with no venues for the answers.

Here is the guide following which you will be able to find the power source and supply of any appliance you may like.

Here are the three steps that will help you find out what power supply unit you have:

  1. Check the PSU Label

The underwriter’s laboratories askes of every power supply to include a sticker with a power rating. There will always be a label sticker or printed layout of the PSU model number and specifications on a power source.

When you open the case of your PC you will find something written or a label on the body of the PSU. This is one way of checking the label on one’s PC.

When the power source is covered with a shroud, it is advised to take the power supply since it is not visible in the given scenario. When you take it out you can know about its model and specs.

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PSU Label

This may require unscrewing of 4 or 5 screws to take your power supply out of your computer and can get tedious just to have a look at the specifications.

Precautions: Be sure to disconnect your PC from the power source, any active current flowing can harm you severely make sure to also turn off the PSU before touching it.

Once you have your power supplying unit out, you can take a look at its body and see if there is any label or any writing on it.

On the label in writing or body, everything is mentioned like the model number, certified ratings, and all other specifications of your power source.

The screwing can be tedious but if not taking that into account reading the label for the power supply’s specification is quite easy.

  1. A manufacturer’s website should be your next stop

Most of the PC used today by the population are pre-built by any manufacturer. In such a case you can visit the official website and search the product page for your computer model.

On this page, there are all specifications mentioned and you can find the PSU used in your computer.

The easiest way to find one’s power supply’s wattage.

  1. Find out the power supply details on its box

The box in which the appliance has been received most of the time specifies the model and its specification. Some also come along with an international manual.

PSU box

Here also, you can check the power supply- wattage, model no. and other required specifications.

How to check PSU wattage on PC

Since now you know what power supply unit you have. Wouldn’t it be handy to know how to check the power supply wattage too?

Again, you can apply the above-mentioned steps.

One of the easiest ways is to just check the box in which your appliance came or PSU came. These boxes have all the specifications mentioned on the box or on a manual that comes along inside the box.

If lost the box you can check the manufacturer’s website or best look upon the body of your PSU.

Why know about your power supply?

If you are well aware of what power source you are using it will be easier for you to choose which components you need to add(graphics card, RAM, and fans.) You can avoid overclocking your computer. And one of the most important is that you keep upgrading your full system without changing the power supply.

A PSU’s most important features are its wattage and ratings.


However, knowledge of these two is not enough. Knowing the tier that your power source belongs to is essential too since different power supplies of the same wattage and rating perform differently.

Which Is The Best Power Supply Calculator

There are dozens of PSU calculators on the web. But most of the power supply calculators falter to predict wattage and certifications.

Some of the most accurate PC wattage calculators are listed below:

  1. Cooler Master Power supply calculator
  2. Seasonic Wattage calculator
  3. Asus PC power supply calculator

The best practice is to first check out the latest PSU tier list and then get a suitable power source according to one’s computer’s needs.

Frequently Asked Questions

What does a power supply unit do?

The purpose of a power supply unit (PSU) is to supply power to all of your PC components.

How to find out what power supply you have without opening the computer?

You can check the store-bought or online receipt.

How to tell if your power supply is bad?

When the Power supply is dying or turning off your PC continuously while running it, then the probability is that the power supply is bad.


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