How to know what size psu you need

OuterVision Power Supply Calculator is the most accurate PC power consumption calculator available and is trusted by computer enthusiasts, PC hardware and power supply manufacturers across the Globe. Are you building a modern gaming PC, low power HTPC media server, or maybe you need to figure out power requirements for a rack in a data center?

Building cryptocurrency mining rig? Check our Mining Rig Builder tool. Basic version of the OuterVision Power Supply Calculator allows users to quickly estimate power consumption with minimal selection of PC parts. On the other hand, our Expert, more advanced version of the PSU Calculator greatly extends the ability to select various PC parts and components, adds CPU and Graphics card overclocking, and allows consumers to calculate PC energy consumption, compare PSU efficiencies, and ultimately project energy cost.

Note: Standard keyboard, mouse, and 8 hours of computer utilization per day already included in calculations. What power supply do I need?

To answer this question, OuterVision PSU Calculator analyzes dozens of power supplies per each certification category, compares their efficiency, unit price, computer power consumption, overall PC energy cost, and payback period. Based on these analysis, we provide recommendation to our users with the best bang for the buck power supply per each certification category. The user has an option to compare the recommended power supplies, adjust electricity cost to see PC's overall energy cost per year, and select the right power supply that fits their budget.

CPU Speed. CPU Vcore.

how to know what size psu you need

Core Clock. Memory Clock. Optical Drives 0 1 2 3 4 5. PCI Express Cards 0 1 2 3 4 5. Liquid Cooling Kit 0 1 2. Liquid Cooling Pump 0 1 2.It's a must tool for estimating the power consumption of a modern desktop PC. It can be used to select a proper power supply unit for your system. It can also be used to calculate the cost of electricity as well as optimize the parts for energy efficiency or low noise levels. The calculator estimates both the idle and full load power consumptions and recommends a PSU wattage rating for the selected components.

However TDP is only a specification of how much power the cooling system should dissipate for the component to stay within the thermal limits in extreme conditions. Many assumptions and predictions has to be made to give you a rough estimate of the total system power. In many cases, that's not the actual power. We on the other hand, have gathered thousands of results from various real-world benchmarks and manufacturer data sheets to extract the real power of these components.

By doing so, we can increase the accuracy significantly and also estimate the idle power consumption of the system.

How to Pick the Correct Wattage Power Supply

True power consumption PowerSupplyCalculator. How does it work? To prevent confusion, only modern CPUs are listed.

Change CPU speed to overclock or underclock. Change Vcore to adjust core voltage from stock value. RAM size does not affect the results. Linking is taken into account only if video card count is higher than one per row. Choose the second card only if there are different cards on the system. OC marking in the end means the card is an overclocked model.

Include all USB and FireWire devices on the system, except for the keyboard and mouse since they can already be included in common devices. We use this information to compensate the recommended wattage against capacitor aging.

After selecting all the components on your system, press "Calculate" to view the results. The results do not include PSU power losses or devices connected to external power sources like monitors and printers. We assume the system has a single monitor attached to the GPU.

If you have a multimonitor setup, the results may vary. We assume the system is working in a power saving mode if available. We assume the system fans are temperature controlled. We do not take the system start-up power surge into account.

Systems with numerous hard drives may encounter a large start-up power peak. Modern computers use the 12V rails to generate most of the voltages in the system.

Added CPU overclocking options. If you found this site useful, consider donating some bitcoins or litecoins to support the future development of the site.The power supply is an oft-underappreciated component. Note that all references to household current are U. Oddly, the current coming in from the wall is converted to DC direct currentand then converted back to very high frequency alternating current.

Trying to convert directly to DC current from 60Hz would require massive components, and PSUs would be unnecessarily large. This high frequency AC is then converted to DC. A rail represents a single voltage source. The 12V rail was once a fairly minor component in power usage inside the PC, but two things changed all that. The second thing that happened is that PCI Express graphics cards began using external power connectors for high performance products.

So now the most power hungry parts inside the PC require 12V power delivery. The thinking behind a single rail is that any particular 12V connector can draw all the power it needs, up to the total 12V limit for the PSU.

Multiple rails are safer, with better circuitry for shutting down the PSU and protecting the system if current draw on one rail is too high. For most users, the number of rails is irrelevant to overall performance. This is the biggest bugaboo power supply buyers face: how much power do I need?

Various power supply calculators exist, like the ones at Outer Vision and vbutils. These are useful tools to give you a baseline, but most of them lack listings for every possible component. Under a heavy load, that system drew W. Most normal systems can get by with less than W. Another problem with these calculators is that not all PSUs are created equal. Other higher end power supplies from other companies like Antec, Coolermaster, Seasonic Enermax and others are equally well built.

Both have two 6-pin and two 8-pin PCI Express power connectors. But the Diablotek is rated to deliver 54A on its single 12V rail.Thank you for supporting the work I put into this site! 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.

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. 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 softwarebecause 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. Corsair Link Hub.

How to choose a PC power supply

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 RM power supply of Watts. Input Voltage — It is the AC voltage at which the power supply operates, and this you have to supply to it. Some power supplies can operate in a wide range of voltages i.

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. These are also known as Rails i. Here I have not included V Rail, because it is no longer used, and is present for some legacy support only.

Below, you can see a single 12V and Dual 12v 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 is calculated in Watts, which is the product of Voltage and Current. So, the formula for power is as follows:. 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.

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.

If you have a pre-built PC then you can refer your manual for its specifications that can tell about the installed power supply. 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.So how do you tell what power supply your currently have in your system? Then, you just need to look and see what wattage your power supply is.

The power supply itself usually tells you with a label on one of its sides that gives you some general specs. All power supplies have an identification label, as required by UL — formerly referred to as Underwriters Laboratories. As a safety measure, make sure to turn the power supply to the OFF position, too. This is usually resembled with an O icon, either on the back of the case, or on the power supply itself inside of the case. Once you pull the power supply out, you should see a label on the non-visible side.

If you upgrade a component on your computer to something more powerful, you may or may not need a new power supply. And now we come to the most difficult part about buying a power supply. How much wattage — or Max Load — does your power supply need? Luckily, there are a handful of free online tools that will help you find the wattage that you need. The way these work is that you enter in the PC components that you have in your PC — or the PC parts that you plan on buying — and it will then calculate the power draw of all of those components.

Buying a power supply without knowing anything about them and the manufacturers that build them is like playing Russian Roulette. There are honestly power supplies out there that are deadly, and should be avoided at all costs. The power supply can literally be the life or death of your machine. So how do you know what power supply brand or manufacturer to buy from? As you can see, finding out what power supply you have — as well as how much wattage you need for your newly built PC or upgraded parts — can be quite a task.

Now, we have large databases of computer parts where we can easily add up their power load through the magic of software. Do you have a power supply that you stand by for all your power needs?

What is it?Unfortunately, your power supply does not interact with your motherboard in any way that would communicate its model information. Consequently, you can only determine the total output of a power supply by physically examining it. All power supplies, like the one shown to the right, have a sticker that gives all important specifications. For example, this power supply lists the total output as W watts. If you have a computer that is already assembled, you can determine how big the power supply is by opening the computer case and examining the unit.

As you can see in the image above, this Chieftec power supply is rated at Watts. Many power supply manufacturers also use the wattage of the power supply in the model number.

All power supplies are required by UL formerly known as Underwriters Laboratories to include a sticker with power ratings on it. If you're unable to locate a sticker on your power supply, it's possible that the identification may be on the side that is not visible.

If this is the case, you need to remove the power supply before being able to identify it. The steps in doing so are listed in the additional information links listed in the next section of this page.

If after removing the power supply, you are still unable to find a sticker with the power ratings, we recommend purchasing a new power supply. A power supply without a sticker on it is dangerous to use, as it could be a very low quality unit and cause damage to your computer. How do I determine how big my power supply is? Additional information How to install a computer power supply. How to find what hardware is installed in the computer.

See the power supply definition for further information and links. Computer power supply help and support. Was this page useful?Thank you for supporting the work I put into this site!

Graphics card is one of the most power-hungry components for any computer whether gaming PC or a work PC. The power requirements of a graphics card depend on the GPU model used, because graphics cards with budget or entry-level GPUs consume less power, whereas mid-range and higher-end GPUs need significantly more power to operate.

It is very important to select proper power supply for your graphics card because if you get and underpowered PSU then it will not be able to supply enough power to your graphics card and other components, causing restarts or can burn out too and may cause damage to your other computer components including the video card. On the other hand, if you get a higher wattage or overpowered power supply then it will be just a waste of your money.

Therefore, it is very important to find a proper balance between price and power consumption, so that you can buy the right power supply for your graphics card. So, here in this post, I am going to guide you on how you can choose a proper power supply unit PSU for your graphics card. Here are the most important things that you must consider when getting a new PSU for your new graphics card.

The first and foremost thing to do is to check your GPU or graphics card power consumption specified by the manufacturer on their website. All the GPU manufacturers or graphics card manufacturers list the power consumption and the recommended power supply for their graphics cards.

how to know what size psu you need

The recommended PSU specified for this card is W. You can look for this information for the graphics card you have or that you are going to buy. This will give you some idea about the wattage of the PSU that you will need for your graphics card or whole PC. If your graphics card requires external power connectors such as 6-pin or 8-pin PCIe connectors then you have to buy a power supply with these connectors included in it.

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Technically, the most important thing to look for in a PSU is the amount of current present on 12V rail. If you do not have sufficient current on the 12V rail of your power supply then you can face serious performance issues, restarts and may end up burning your power supply and causing damage to your precious and expensive components. I am telling you this because I have seen may power supplies with higher wattages but very low current on the 12V Rail, so my advice is to avoid these cheap power supplies with lower 12V rail current rating.

Tip: It is better to get a PSU with a single 12V rail over multiple or dual 12V rails because it is said that a single 12V rail provides better overall stability under heavy load. Always go for a branded power supply if you care about the performance and well being of your computer components. Cheap Unbranded Chinese power supplies may attract you at first, but in the end, they are nothing but trouble. Branded PSUs may cost a little higher but they are very reliable and provides you accurate current, voltage, and power that are needed for the long life of your PC hardware components.

Lastly, you have to asses the total power consumption of your PC if you have more hard disks or case fans installed in your PC. You can do this by using power supply calculator tools available online or can ask here. If you have a normal PC with two case fans, two hard drives then you can go with the same wattage power supply that is recommended by the graphics card manufacturer on their website. If you have extra components installed then you can add W to the PSU wattage which is recommended by your graphics card manufacturer.

This is really not an important factor but if you have an 80 Plus Certification power supply then it will be more power-efficient compared to the ones without it.

how to know what size psu you need

If you are still unsure of what capacity power supply you should get for your graphics card then you can ask your query here by completely listing your budget, PC specs including the model of your graphics card.

I will be happy to recommend you the best PSU for your graphics card or gaming needs. I have done M. Tech in IT and B.


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