If you have decided to build a computer , it is likely that you will have some doubts , especially if it is the first time you do it.
The most typical doubts that arise are usually about the amount of RAM memory that is needed , about the compatibility between components, and also the amount of energy or power of the power supply.
It is precisely to this last point that I will dedicate this tutorial, where you can learn in a simple way to calculate the watts you need so as not to fall short or go overboard with the acquisition of the ideal power supply or PSU. Especially important if you purchase a non- modular power supply .
Can I calculate the power manually?
The most rudimentary way is to use a pencil, paper (or do it digitally) and write down all the components that you are going to include in your PC.
In one column you write down the component and in the other the consumption in watts (w) that each of those components has. When you have them all, add the watts and you will have the result.
For example , imagine that the result is 640w. You shouldn’t buy a 650w power supply as it’s too tight. Keep in mind that
if you have the idea of updating a component in the future or if you need to add some other component to expand it, then 10w is a minimum amount that does not leave you freedom for more.
For this reason, the ideal would be to buy a somewhat larger source, such as a 700w one. That way, if you decide to expand your system,
you won’t have to buy a new power supply or use adapters/splitters to try to get more connectors out of the molexes, etc.
If you do not have knowledge about the consumption of the components you will have it complicated. You will have to look for the information one by one.
Where can you see consumption? That is the biggest problem with this method, that if you have no idea what the consumption of each component is, you will not be able to make the list with the data.
In many online stores and product descriptions, some consumptions usually come, but it is not usual. They are not given on the manufacturer’s own website if they are not relevant data.
If you use the PC configurators such as PCComponentes, Alternate, etc., you will not need to perform this calculation, since they automatically guide and help you to choose the compatible components and adequate power.
Therefore, it is recommended to use the following procedure suitable for all users.
How to calculate power with the help of a tool
If you prefer another way to calculate the power of your future equipment and the ideal power supply, you can use an online calculator created by Geeknetic. It is very intuitive to use and quick to know what you really need. To do this, you can follow these simple steps:
This way you can have an idea of the source you need to buy for your PC configuration and not make a mistake. But if you have any extra devices that are not included in the Geeknetic item list, then you can do two things:
Choosing a good PSU or power supply
Now that you know the power required for your PSU or power supply , you can choose the brand and model of power supply.
If you also have doubts about this, you can consult our specific guide to choose the best among all the available ones, as well as to know the most important technical details.