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How to Check PC Power Supply: Test PSU

How to Check PC Power Supply

It might be worth checking your power supply when you’re experiencing sudden shutdowns or random reboots on your PC before assuming it’s a software issue. A faulty power supply unit (PSU) is one of the most common culprits behind computer problems. But how do you know if your PSU is working correctly? Keep reading to learn how to troubleshoot and diagnose your computer’s PSU issues.

A reliable power supply is essential for ensuring stable and safe PC operation, but not all power supplies are created equal. That’s why it’s important to understand the key identifiers of a good PSU and how to check if yours is up to par. Read on to earn everything you need to know about checking your PC power supply to keep your system running smoothly and avoid potential disasters.

Why Does Power Supply Type Matter?

Power Supply Type

The type of power supply you use can significantly impact your computer’s performance and safety. Foremost, the wattage of your PSU is crucial as it determines how much power it can deliver to all the components in your system.

It’s important to note several key identifiers when selecting a power supply unit (PSU) to ensure your PC receives the power it needs to operate.

  • Wattage refers to the amount of power that the PSU can deliver. Choosing a wattage that matches or exceeds your PC’s requirements for all components to function properly is important.
  • Efficiency is also an important consideration when choosing a PSU. This refers to how much energy is lost as heat during operation and can affect both performance and electricity bills.
  • Power delivery protection measures protect your PC from sudden voltage spikes or drops. Look for features such as over-voltage protection (OVP), under-voltage protection (UVP), and short-circuit protection (SCP) when selecting a PSU.
  • Rails and cables refer to the number of 12V rails included in the PSU, determining how many components can be powered simultaneously without risking damage.
  • Form factor compatibility must be considered when choosing a new or replacement PSU that fits perfectly into your case without causing any issues with space constraints or cable management problems.

How to See What Power Supply I Have on My PC

Are you experiencing sudden shutdowns or poor performance from your PC? Your power supply unit (PSU) might be the culprit. Checking your PSU wattage is crucial in determining whether or not it can handle your computer’s demands. And while some may think checking requires opening up their computer, there are easier ways to go about it.

1. Read Your Computer Manual

Knowing where to find the information you need is essential to begin checking your PC power supply. The best way to do this is by reading through your computer’s manual or searching online for information about your specific model.

Your computer’s manual contains vital information regarding its specifications, including power supply details. It will provide all the necessary details, such as wattage and amperage ratings, to help determine if your system is receiving enough power.

If you don’t have access to a physical copy of the manual, several online resources may contain similar information. A quick Google search using your computer’s make and model number should yield results with detailed specs and other relevant data.

2. Check the Power Supply Information

Checking the power supply information is crucial in determining whether your PC’s power supply unit (PSU) functions correctly. The PSU supplies power to all components inside your computer, so your computer won’t turn on if it fails.

You must locate the label on your PSU to check the power supply information. The label contains important details about your unit, including its wattage rating and efficiency certification. The wattage rating indicates how much power the PSU can deliver to your system while operating efficiently.

Efficiency certification tells you how efficient your PSU is at converting AC from a wall outlet into DC voltage that powers your computer components. A higher efficiency rating means less wasted energy and lower electricity bills.

3. Open Your Computer

Now that you have checked your computer manual or searched the internet and found the power supply information, it’s time to check your PSU physically. Remember that opening a computer can be dangerous if you’re unfamiliar with the process. Make sure to turn off and unplug everything before proceeding.

To open your PC:

Step 1: Locate the screws at the back of your computer case and remove them using a screwdriver. Once all screws are removed, gently slide off the side panel of your desktop casing.

Step 2: Next, note where each cable is plugged in so you’ll know how to reassemble everything later. The step is important because incorrectly plugging cables could lead to damage or even electrical hazards.

Step 3: Once you’ve located your PSU inside the case, carefully disconnect all cables attached to it by pressing down on any locking tabs or levers while pulling away from its ports. Unscrew any fasteners holding it in place and slowly remove it from its compartment.

Step 4: Now that you have successfully removed your power supply unit (PSU), inspect it for any visible signs of damage, such as frayed wires or burn marks. Check also for accumulated dust which may affect its performance over time.

Can I Check My PSU Wattage Without Opening My Computer?

Can I Check My PSU Wattage Without Opening My Computer

No, you cannot check your PSU wattage without opening your computer.

Some people recommend hardware tools such as digital multimeters or power supply testers to measure the voltage output from different cables connected to the PSU. However, remember that the method only provides estimates and may be inaccurate. It’s always best to open up your computer and physically check, if possible, before deciding to upgrade or replace your PSU.

Can I Check Power Supply on the PC Software

No. While wattage is often used to measure how much power a device can draw, it’s not the most accurate way to measure power delivery to components. Voltage has become the de facto standard for measuring modifiable power delivery, providing a more accurate representation of the power delivered to components.


Checking your PC power supply is crucial to ensure your computer components get enough power. While there are ways to check the wattage without opening the case, it’s always best to physically inspect and test your PSU. Remember to take safety precautions when working with electronics and never attempt any repairs unless you’re confident in your skills.


HOB Soft

Hobsoft is a team of digital security experts dedicated to providing honest, unbiased reviews of computer software to help users find the best solutions for their needs. Our reviews, tips, and how-to guides are based on extensive testing and personal experience, ensuring that we provide reliable and valuable information. With a background in digital security products and services, Hobsoft's expertise ensures that our reviews are both trustworthy and informative. Our team is committed to providing accurate information and helping users navigate the ever-changing world of digital security.