Do you want to know what power supply you have in your PC? If your answer is yes, then keep reading as here I am going to tell you about how you can find out the details about your PSU, which is currently installed in your computer. It is always good to know about your computer components, particularly PSU because it is one of the most important computer components, but its importance is often ignored by most of the users. If you have built your own custom PC by yourself, then you would already know about all of your components, including the power supply, but if you are not that tech-savvy and have purchased a pre-built PC, or somehow got an old PC from somewhere, then it might be possible that you don’t know about your PSU. So, to help you out, here I am going to tell you the ways by which you can find out about your power supply specifications.
Why know about your PSU?
Now, the question comes why you should know about your PSU? Well, the answer to this is that if you want to upgrade your graphics card or want or add a graphics card or any other component, then you should know about your PC power requirements. This is because the new component will put extra load on your PSU, and if your computer power requirements exceed your PSU Wattage, then it will stress out your PSU and may cause it to fail or burn down, and this may also result in damage to your internal components. Also, if you want to upgrade your PSU then you must know about the specifications of your current PSU so that you can make the right decision in choosing a better and more powerful power supply. Unfortunately, there is no way to know about your PSU specification by using any hardware detection software, because the PSU does not have any communication interface with the motherboard, as its only job is to deliver power to the components.
Note: There are few high-end power supplies, especially from Corsair that lets you monitor and manage fan speed, temperature, and power output through their software, e.g. Corsair RM / AX / HX Series power supplies. They include special cable/connector that connects through motherboard USB header, using a special hub e.g. Corsair Link Hub.
Must Read: Best PSU Calculator Tools to Calculate your PC Wattage
How to Find out about your PSU
Here are the ways by which you can know about your power supply details or its specifications.
[by Opening the PC Case]
The most preferred way to know about your power supply or PSU, which is by opening your computer case side panel and look for a sticker or label on it, which provides the important information about your PSU, that includes PSU Name / Model number, Power/Wattage, Voltage and Current details. The sticker/label is present on every PSU, and it can be seen either on the sides or at the top, depending on the manufacturer. If you know how to read the label and what all the technical information on it really means, then it is good, but if you don’t, then below I am going to tell you all about it.
How to Read PSU Label / Sticker
On every PSU label, you will find the following information:
PSU Name / Model – On the label, you will find the brand & name of the PSU, and its model number. You can also find the total Wattage of the PSU, which is generally printed in huge fonts, and also the 80 Plus Certification Rating (if it has one). Below is a Corsair RM550 power supply of 550 Watts.
Input Voltage – It is the AC voltage at which the power supply operates, and this you have to supply to it. For the US, Canada, and most South American countries, it is around 110V – 127V, and for UK, Europe, Asia, Africa, and Australia, etc., it is 200 – 240V. Some power supplies can operate in a wide range of voltages i.e. from 110V – 240V, as they have an auto-switching mechanism to detect input voltage and can switch accordingly. However, others can have a physical switch that allows you to select an appropriate voltage based on the voltage supplied in your area or country.
DC Output – It is the output voltage provided by your power supply. The standard output voltages provided by a typical ATX PSU are +3.3V, +5.5V, +12V, and +5VSB. These are also known as Rails i.e. 3.3V Rail, 5V Rail, and 12V Rail. Some power supplies do come with multiple 12V Rails, such as Dual 12V Rail, Quad 12V Rail depending on the PSU manufacturer or model. Here I have not included -12V Rail, because it is no longer used, and is present for some legacy support only. The +5VSB (standby voltage) Rail is always ON, and is used to power mouse, keyboard, memory, LAN, and BIOS memory when the PC in standby mode to support “Power On features”. It also provides a small amount of power to BIOS & motherboard, even when PC is powered OFF (but mains in ON), and is used to start the PSU or Computer when you press the PC power button ON. Below, you can see a single 12V and Dual 12v power supply.
Single 12V Rail in a Power Supply
Dual 12V Rails in a Power Supply
Max Load (A) – Below each voltage level or Rail, you can see the maximum amount of current (in Amperes) that each Rail can provide. For example, if 12V Rail has 35A current listed under it, then it cannot provide more than 35A current combined for various devices or components that you have in your PC. If you overload it then it may result in PSU failure or computer shutdown.
Maximum Power (Combined) – It is the maximum power for a single rail or for combined rails. The power for +3.3V and 5V Rail is combined and calculated collectively, while the power for 12V Rail or Rails (in case of multiple Rails) is listed separately. The power is calculated in Watts, which is the product of Voltage and Current. So, the formula for power is as follows:
Power (W) = Voltage (V) X Current (I)
Total Power – It is the total power of the PSU, which is expressed in Watts. Some manufacturers calculate the total power by adding the power of all rails, while others state this on the basis of total combined power present on +12V Rails only, because it is the most important Rail of the PSU, and is used to power 80% to 90% of your computer components that include your processor, graphics card, case fans, hard drives, etc.
Find out about cables & connectors
After opening the case, you can also check the number and types of connectors and cables that your power supply has. Below are the most common types of cables that you generally find in a power supply that is ATX 12V 2.2+ complaint.
How to know in-depth information
After knowing about the name and model number of your PSU, you can go to its manufacturer website to know more details about it. You can also download the PSU manual or specs sheet from there. For example, if your PSU is Corsair VS550, then you can search this model on google or directly go to the manufacturer’s website to know about its complete details.
Refer Manual / Search Online
[For Pre-built PC]
If you have a pre-built PC then you can refer your manual for its specifications that can tell about the installed power supply. If you don’t have the manual then you can also refer the manufacturer’s website; search your PC model number there, and check out the PSU specifications listed there for your PC model number. This information might not be always accurate, because some manufacturers can change the PSU in their newer variants of the same PC model, so it is always better to open your PC case side panel to check your PSU model and specifications.
- What Power Supply Do I Need for my PC?
- How to Check a PC Power Supply & Best PSU Testers
- PSU Fan Orientation Guide for your Computer Case
- PSU Fan Not Spinning [Causes and Solutions]
- Best Budget Power Supply (PSU) for Gaming
- What Motherboard do I have in my Computer?
- What Graphics Card do I have in my Computer?
- How to Find the Right PSU for your Graphics Card
If you have got any queries regarding the power supply (PSU) you have or its specifications, then you can ask me here by leaving a comment below.
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Trying to make another bench top power supply out of a PC power supply but this one is different than the first one I did the color code is different than everything I’m finding online the case says it’s a X power model ps-400w the 3.3v wires are purple with an extra purple marked on the board as s+ orange is marked pg grey marked PS and brown marked vbs can you please help me understand what to do with the four wires not marked as voltage and if I will have to put a resistor across the 5v side to show a load and keep it from shutting it’s self down didn’t have to with my first one but all the instuctables mention it is sometimes necessary thank you for your time
Sorry, did not understand it completely.
My ATX power supply (purchased June 2007) appears to have failed. I have another very similar PSU, though of lower output (400W vs 520W) that has similar voltage outputs. My problem is the CPU 4pin (2 black+2yellow) lead is not long enough to reach the motherboard pins. Would this be a different generation of ATX PSU? Can I extend this lead wire? Are adapters available?
Many thanks, Brian
Check the ATX specification of both the PSUs. It is in the form of ATX12V 2.x.
the only thing my power supply says on it is 100-200V, 10A, and 50-60Hz
Bro i need a graphics card under 3k
What currency in 3k?
3080 starts at 600, buy it!
system pc need only 480w power or psu
If a higher power supply (1500w) is purchased and installed. No problem??
No problem using a power much higher than the system requirements? Not a problem for the system?
There is absolutely no issue with installing power supply having higher wattage.
Sir, What is UK and US represent in PSU? Which model is available and used in India?
UK one works with 230V, the same as in India while US works with 120V.
That means..UK power supplies (eg:- Cooler Master RSA00-AFBAG1-UK 1000W) are commonly used in our country isn’t it?
Yeah, some are.
Hi, I’m trying to figure out my PSU and if I need to upgrade it with some other new parts, but I can’t see the sticker with all of the information. I don’t really want to open it up, and all I need is the output wattage. Is there a way to run a command prompt that can find this, or do I have to take my PSU out to get the info I need?
No, it cannot be done using any command or software. The sticker should be there on the PSU.
Sir which psu is better Corsair RM1000X or Cooler master V1000?
Both are very good but I would prefer Corsair RM1000X.
Why you should choose corsair over Cooler master v1000?
Higher operating temperature of 50 degree Celsius and overall better quality.
But some reviewers state that cm v1000 born from Seasonic KM3 platform (OEM Partner) it has superb quality than corsair they said like that..?
Both are neck and neck and you cannot go wrong with any one of them.
Both are 80+ gold models..
Thank you for your valuable time and response.. ❤️
I bought my son a gaming PC two years ago. Over the past 6 months it started running rough as far as the sound, fans not operating like they were, PSU making funny noises, and it started crashing, especially when trying to load the game or during in game play. Hard drive started ticking, not showing up on the pc itself like it just didn’t exist. I replaced the hard drive and now it’s doing the same thing. Became impossible to play or do anything at all on the pc without it completely crashing and powering off and restarting. Now, it will not even turn on at all. I know that the PSU could have caused all of this and feel like maybe it needs something with more wattage I’m not sure. It’s a bad ass system that requires the cooling liquid stuff, which is full btw. The PSU is a Rosewill Lightning 1000w 80 plus Gold. Idk what to do. Should I buy a PSU with higher wattage or one with a higher 80 plus certification?? Or both? Please help as I don’t know a whole lot about it, I’m learning obviously, but I need to fix the issue for him. Thank you
I think the PSU is faulty. Check the system with another PSU. Also, what is your system configuration?
I have micro power supply zeb-m450W(dsata). Motherboard asus h81m-cs core i3 processor and 12 gig of ram, 1 pciex16 slot as per manual pciex16 version is 2.0. Could you suggest me better gaming graphics card for the above said details? Thank you.
Is this the Zebronics 450W power supply? Also, what is your budget?
Hi Akshat thank you so much for your response. I check the psu watt as suggested in the link provided by you and confirm it is zebronics micro power supply 450w psu. My budget is around 4000-6000 with a good graphic rendering and a decent gaming performance. Thanks.
In this budget the best you can get is the GeForce GT 1030 2GB GDDR5 graphics card.
I was wondering how I would check a PSUs wattage if there is no visible sticker on the visible side of the PSU
all it says there is that it passed a few tests
Also whats the minimum wattage for a PSU if it has 6pin and a 6+2pin + 3 molex
There should be a model number present which you can look up on internet and find out its specification.
I just bought an old (2012) i7 HP pc. I am trying to add a better gfx card, I need to upgrade the psu.
Problem is that the pc has a non standard 12v only 320w psu, with a 6 pin and 4pin connectors on the MB. Can I get a regular psu and with a multi meter find a way to modify the cables ? Or should I just get a separate psu for the gfx card ?
Well, a 320W PSU is able to support some good mainstream graphics cards like GTX 1650, GTX 1050 Ti which I think would be enough for your requirements.
Hi, I’m building a gaming PC, but I’m not sure what power supply I’d need for a computer with these specs:
AMD Ryzen 3600
500gb SSD M.2
5 cooling fans and one cpu cooling fan
Thanks, very helpful page.
A good 600W PSU should be enough. I would suggest Corsair CV650 or Cooler Master MWE 650.
Ok, nice info… but… in the prebuilt section… you completely ignored what to do… if the pc tower you have, is a 2nd/3rd hander.. or older.. on figuring out what your psu, is.
Mind letting it be known if there is a means to know just what that is.. if the casing is not a mfrs prebuilt, but someone else’s scratch built tower. &… the sticker info on the psu is missing or not readable an more.