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PassMark
passmark.com › products › inline-psu-tester › index.php
PassMark Software - Inline PSU Tester
This is a quick introductory video on our Inline PSU Tester. Understand how you can troubleshoot and diagnose your PSU quickly, safely and with confidence. Quickly check if supply voltages are within the approved limits, measure and check timings such as Power-On Time and Power_OK Delay and test 'inline' while connected to your motherboard. Right-click to download in MP4 format.
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Corsair
corsair.com › explorer › diy builder › power supply units › how to test a psu (power supply unit)
How to Test a PSU (Power Supply Unit) | CORSAIR
May 20, 2024 - If your PC is experiencing power problems, here's a quick way to test the PSU to help you narrow down the cause of the issues.
Discussions

Any recommendations for a PSU tester?
They're like $10-15 on Amazon, just buy one that has a lot of reviews. There isn't much too them, I own several cheapo ones and they all work just fine. Not sure if it'll provide much info for you though, the testers are more of a "good or bad" thing, it's not going to tell you anything in between. I suspect my Power Supply is failing. Can you provide some context to what your issues are or why you think it's the PSU? More on reddit.com
🌐 r/buildapc
7
3
May 16, 2025
what is the best software to monitor the use of my psu ?
You mean a power monitor? Get a Kill a Watt monitor or those smart plugs that support power usage monitoring. More on reddit.com
🌐 r/pcmasterrace
3
1
July 6, 2021
A proper power supply tester is a tool that basically everyone in this hobby should have.
I didn't know testers were so inexpensive. Thanks for the link. More on reddit.com
🌐 r/buildapc
267
2284
May 8, 2019
did you know psu testers exist? what if someone used this to test psu's going into a bunch of budget builds, would that be ok in the eyes of the PCMR subreddit community?? what does ja rule think about this?
That doesn't actually test the power supply. All it does is read the voltages supplied by it. Testing it would involve putting the power supply under load and reading the voltage and current output. More on reddit.com
🌐 r/pcmasterrace
17
0
November 30, 2023
People also ask

How many watts does a PSU need, and how do I know that the PSU is the right size?
To make sure that the Power Supply Unit (PSU) fits your computer correctly, first, check the wattage to ensure it matches the power requirements you calculated for your PC components. How do you check your PSU wattage usage? The simplest way is to check the label on your PSU. It typically shows the maximum wattage it can provide, representing the PSU's capacity. It's a good practice to choose a PSU with slightly more wattage than you calculated to be safe. You can also use the power supply calculator to estimate your computer's power needs based on its components. · Next, make sure your PSU fi
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newegg.com
newegg.com › tools › power-supply-calculator
PC Power Supply Calculator – PSU Wattage Calculator | Newegg
Why do you need to calculate the wattage of a PSU (Power Supply Unit)? And how can you use the Newegg power supply calculator to determine the right wattage for you?
Calculating the wattage of a Power Supply Unit (PSU) is important because it ensures your computer gets the right amount of power. The best power supply for your PC build is the one that delivers the correct amount of electrical power to all components at once. To determine the correct PSU for your PC build, you need to find the total power your PC requires, measured in watts. First, consider and calculate the power needs of your PC's components, including CPU, MotherboardGPURAMhard drives, and any other devices you plan to use. · The power supply calculator will help you multiply the total am
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newegg.com
newegg.com › tools › power-supply-calculator
PC Power Supply Calculator – PSU Wattage Calculator | Newegg
What is the Newegg PC power supply calculator?
A power supply calculator is a tool that estimates the wattage and amperage your custom PC build needs based on the components you select. Choose Newegg's PC power supply calculator to build the perfect computer for your needs. Select the components you want, such as the CPU, GPU, and motherboard, and use our PSU wattage calculator to ensure each component receives the right amount of power. · Newegg's PSU calculator simplifies the PC building process by taking the guesswork out of selecting the right components. It helps you avoid the risk of underpowering or overpowering your PC. Our compute
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newegg.com
newegg.com › tools › power-supply-calculator
PC Power Supply Calculator – PSU Wattage Calculator | Newegg
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Amazon
amazon.com › Computer-PC-Tester-Connectors-Enclosure › dp › B076CLNPPK
Amazon.com: Computer PC Power Supply Tester, ATX/ITX/IDE/HDD/SATA/BYI Connectors Power Supply Tester, 1.8'' LCD Screen (Aluminum Alloy Enclosure) : Industrial & Scientific
Amazon.com: Computer PC Power Supply Tester, ATX/ITX/IDE/HDD/SATA/BYI Connectors Power Supply Tester, 1.8'' LCD Screen (Aluminum Alloy Enclosure) : Industrial & Scientific
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Newegg
newegg.com › tools › power-supply-calculator
PC Power Supply Calculator – PSU Wattage Calculator | Newegg
Newegg's PSU calculator simplifies the PC building process by taking the guesswork out of selecting the right components. It helps you avoid the risk of underpowering or overpowering your PC. Our computer power supply calculator will make buying easier whether you are looking for specific gaming ...
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GAMEMAX
gamemaxpc.com › pc-power-supply › 3775.html
How to Test a PC Power Supply?
Turn on the PSU. The tester will show the voltages and alert you if anything is out of range. Another practical way to test your PSU is by running high-demand programs like games, 3D rendering software, or stress testing tools.
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Amazon
amazon.com › psu-tester › s
Amazon.com: Psu Tester
Discover reliable PSU testers featuring multiple connector support and automatic alarm functions for quick diagnosis.
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Coolermaster
legacy.coolermaster.com › en-us › power-supply-calculator
PSU Calculator | Cooler Master
Accurately determine your power supply needs for your PC build. Easy to use, reliable results. Optimize your system's performance today!
Find elsewhere
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OCBASE
ocbase.com
OCBASE/OCCT : Free, all-in-one stability, stress test, benchmark and monitoring tool for your PC
Ocbase is the home of OCCT, the most popular all-in-one stability / stress testing / benchmarking / monitoring tool available for PC
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Corsair
help.corsair.com › hc › en-us › articles › 360025085372-PSU-How-to-test-a-PSU-Power-Supply-Unit
PSU: How to test a PSU (Power Supply Unit) – Corsair
If your system is having issues turning on, you can check if your power supply unit (PSU) is functioning properly by performing a test.You will need a paper clip or a PSU jumper to perform this tes...
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be quiet!
bequiet.com › en › psucalculator
Power Supply calculator - calc for silent PSUs from be quiet!
The selected GPU generates high peaks of electric load. As a result some PSUs are excluded from the recommendations.
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Tom's Hardware
tomshardware.com › pc components › power supplies
Thermaltake's power supply tester lets you know if your power supply is working properly — Dr. Power III updated with support for ATX 3.0 power supplies | Tom's Hardware
January 11, 2024 - I just use a jumper and a voltage meter but could see why people would like this.Dr Power II can be had for $100 Canadian at Amazon. I am assuming Dr Power III will be in the same ballpark. But even a Dr power II would be more than sufficient to test a PSU, considering it's not a tool you will use often.
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Micro Center
microcenter.com › site › mc-news › article › how-to-test-power-supply.aspx
How to Test Your Computer's Power Supply
September 15, 2023 - PC not powering on? Bought a new PSU and want to ensure it's functioning correctly? This step-by-step guide walks you through the process of testing your PC's power supply unit.
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Windows Report
windowsreport.com › software › utilities & tools › power supply test software
5 Best PSU Test Software for Your Computer’s Power Supply
July 22, 2025 - Once you’ve confirmed your PSU is stable, you can run a computer performance test online to evaluate how your hardware performs under load. Moreover, if you’re looking for the best PSU for the 4090 series of NVIDIA GeForce RTX, we can help out! If you need more info about a PSU Tester or two, don’t hesitate to reach for the comments section below.
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Amazon
amazon.com › power-supply-tester › s
Amazon.com: Power Supply Tester
Discover reliable power supply testers for ATX, ITX, and BTX systems. LCD displays show voltage readings and automatic alarms alert you to issues.
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Newegg
newegg.com › p › pl
power supply tester | Newegg.com
Thermaltake Dr. Power III Pro; ATX Power Supply Tester; Voltage/Continuity/PG; up to ATX12V v3.1 spec; 24pin Main Board/12V-2X6/ 4+4 EPS/6+2 PCIe/ SATA/Molex; Color Display; Black; AC-083-OO1NAN-A1 ... Features: With full support for modern ATX PSUs up to ATX12V v3.1, Dr.
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Reddit
reddit.com › r/buildapc › a proper power supply tester is a tool that basically everyone in this hobby should have.
r/buildapc on Reddit: A proper power supply tester is a tool that basically everyone in this hobby should have.
May 8, 2019 -

Last weekend a friend of mine brought his computer to me. He was at the end of his rope with his machine and why it wouldn't complete POST. He had replaced the memory, he had replaced the CPU, and was getting ready to order a motherboard, since his was out of warranty.

He would not have done ANY of this, if he had talked to me first. When he brought his machine over, I had asked what he had done, and my first reaction was to say, "sounds like a dead power supply". His response is one that I see a lot in this sub, and it drives me CRAZY:

"It can't be the power supply - I did the paperclip test and it starts up! I know the power supply works!"

After I picked myself up from the mild stroke I had, I went out to my garage, grabbed my tech kit, and grabbed one of my favorite tools: my power supply tester. 10 seconds later, I confirmed what I basically already knew: the 5V rail and the CPU's 12V rail was dead. This despite the power supply running.

A power supply tester is only about $15, folks. It's a tool that, IMO everyone who gets inside their machine should have, even if they don't have a problem. It's like a plunger - better to have BEFORE you need one. If for no other reason than you can check yours or loan it to friends.

The paperclip test means JACK as far as knowing your power supply is functioning. Literally all it proves is that the power supply will startup. But that's like saying a car that is up on blocks can drive to the store because the engine starts up.

Edit: because a lot of folks have brought them up, I'll go ahead and address multimeters. They are absolutely a good substitute if you don't have a power supply tester similar to the one I linked. My only complaint with them is that, I don't know about everyone else here, but I don't have the pin-out diagram of power supply connectors memorized (hell - I still have to lookup a patch cable diagram when I make a CAT6 cable as I have it largely memorized but I want to be 100% certain). So I'd have to follow a diagram and ensure that I'm connecting the proper connector pins in sequence and verify that they are putting out the correct voltages. Then consider that a modern power supply can have upwards of 50 pins or more to test (24-pin ATX, 4-8-pin CPU1, 4-8-pin CPU2, 6/8-pin PCIE1, 6/8-pin PCIE2, etc). I still recommend a tester over a multimeter simply for the sake of speed. If you have the time and patience, however, to do a multimeter test, then you're actually probably better off as this tool definitely would fall under Alton Brown's unitasker rule.