One of the crucial aspects which can't be avoided when building a PC is relevant to the relationship between the power supply wattage and the system requirements. If you are planning to build a PC, knowing the connection between system requirements and power supply wattage is crucial, as this way you will get the best PC build possible. 

The wattage of a power supply indicates how much power it can provide, but the supply would only draw the amount of power it needs. For example, if a computer needs 400 watts of power, it would consume the same amount of power as it would from a 500-watt power supply as it would from a 1000-watt power supply. 

So what is the relationship between system requirements and power supply wattage? How many watts of supply is enough for your PC? And what other aspects should one consider when choosing a power supply? If these are some of the questions in your mind, then you are at the right place. 

This article will cover everything relevant to the relationship between system requirements and power supply wattage. So without further ado, let's get started!

Relationship Between Power Supply Wattage And System Requirements

If we talk about the power supply wattage, it is simply the overall wattage supplied to the different components of the PC. On the contrary, system requirements are the overall power requirement of your system. 

Though the power supply unit isn't the most discussed topic in your PC, however, when it comes to system requirements, discussing PSU wattage is a must. The power supply wattage should always be greater than the system requirements; otherwise, your system wouldn't work as it should. 

So how can I be calculative with the system requirements? If you are wondering that you might have to go through the benchmarks and read reviews online, hold up because that is one of the tedious ways to know your system requirements. 

An easy way out is to use a power supply calculator, which you can easily find online. A well-developed power supply calculator will help you list all the components which are used in a PC, and all you have to do is select the components you are using, and you will have the minimum power requirements for your system.

For instance, if you are building or buying a PC with the Nvidia GeForce RTX 3070 GPU, an Intel Core i7-11700K CPU, 16 GB of RAM, 1TB 7200RPM of HDD, and 1TB of SSD, then the overall power requirement you should get from the calculator would be 512 watts. 

So it's best to go with a 600-watt power supply or close to that. If you have the budget, you can go for PSU with a higher wattage but don't go for anything lower than your system requirements.

Is It Worth Going For More Power Supply Wattage?

One of the main things to look out for when choosing a power supply is the power supply wattage. Though you might have the perfect wattage from your power supply which meets your system requirements for now, what if you anticipate upgrades? In the long run, using a power supply with higher wattage is always best. 

Though in the initial stages, it all might seem to be an extra cost, but if are being honest, it's a sustainable option in the long run. You might have to upgrade your graphics card or any other component in the future, which would ultimately increase your system requirements. 

So for that reason solely, it's best to get a power supply that offers you convenience in the long run. Nonetheless, if you are going for a pre-built PC, you must ensure that the power supply it uses has enough juice to meet your system requirements or the upgrades you might add to it.

Does The Efficiency Of The PSU Affect The System Requirements?

Now that we are done dealing with the power supply wattage, the second most crucial thing to identify in a power supply is its efficiency. If your power supply isn't efficient enough, you might not get the best performance from your PC, or even worse, your PC will crash.

Efficiency rating measures how much DC power your PC gets from the power supply unit and how much heat is lost mainly to heat. Why does efficiency matter? It primarily matters because it determines how much you will spend on your PC to keep it juiced. 

An optimal example to understand this is by assuming that a PC's system requirement is 300 watts and if you have a power supply that offers the supply with an 85% efficiency rating. Your PC will pull around 350 watts of input power from your power company. However, if your power supply has an efficiency rating of 70%, it will pull about 420 watts of input power from your power company.

So it's safe to conclude that a more efficient power supply will consume less power, and this will help you save some cash on the overall monthly bills. Another key benefit of using a more efficient power supply is that a power supply with a higher rating will run cooler than a less efficient one. 

Every component in your PC releases heat, contributing to work against top performance. So if you have a power supply unit that is more efficient, it will release less heat and will help your PC perform better. Though this has nothing to do with the system requirements, less heat means a quieter and more reliable system.

When choosing a power supply unit, always check the efficiency rating, and ensure that the wattage of the PSU meets your system requirements. You can try to go with a power supply of 80 PLUS Titanium, as these are the most efficient. However, on the downside, they come at a cost as well.


Power supply wattage and system requirements are directly linked to one another. It's crucial for you to consider both factors when you are building or buying a PC. Always ensure that you have a power supply that offers decently high power wattage; this way, your PC will perform smoothly, and you wouldn't have to worry about upgrading in the long run.