In this post, I’m going to show you how to choose an appropriate power supply for a computer. It is very important to understand certain characteristics of them before choosing the best power supply for a computer.

But before getting started, we must understand why we need a power supply in our system and what it actually is.

A PSU (Power Supply Unit) is essentially a converter, which converts the electrical power provided from the outlet, into power which is then used by the different components inside the Pc. The PSU provides power to all of our parts. Corsair Power SupplyWithout it, the Pc doesn’t function.

Ok, now that we got that out of the way, we can simply choose our unit since it only provides our system with electric power in order to operate, correct? No. It is not that simple.

There are certain rules that should be followed before choosing a power supply. Many people ignore these rules and often buy a cheap PSU for their expensive rigs, as the PSU is likely the most overlooked component, which goes into a Pc. Let’s be logical we don’t want to buy a 1000-1500$ rig and power it up with a cheap and bad quality Power Supply only to experience a power failure or even burn out of components, right?

That’s why we need to consider these rules:

  • Never buy a cheap power supply

A cheap one has most of the time poor build quality and should not even be considered buying.

  • Always buy a premium PSU from known manufacturers like Evga, Thermaltake, Corsair, Seasonic.

Don’t experiment on this. If there is one thing to go safely it is the power supply. Just remember that a poor one can lead to poor electricity conversion and therefore to component failure or degradation.

  • Always choose one with a certification of at least 80+bronze up to 80+ platinum(if you can afford the latter of course) What these numbers actually mean will be analyzed later.


  • A quality PSU should have these protection parameters: Over Power Protection (OPP), Over Voltage Protection (OVP), Short Circuit Protection (SCP), Under Voltage Protection (UVP)

Always look at the specs before choosing your new PSU as these phrases should be mentioned in the specs.

  • Always choose a Power Supply with at least a 3-year warranty up to a 10-year warranty

The best power supply manufacturer, in my opinion, is Evga who provide up to 10 years of warranty for their units.

  • Always keep in mind that the PSU is the most important part of your rig


  • Buy your unit according to the power needs of your system.

For an average consumer level system, with one graphics card and a CPU nowadays, a 550w to 650w power supply should be efficient. But always keep in mind that we are talking about a quality one which can sustain the power advertised on their product. Cheap power supplies often times can not sustain the advertised power delivery on the product

If you purchase with these rules in mind, I promise you that you will have a quality unit for many many years.


The 80+ logo

There are many people out there who get confused by the 80+ logo which is being displayed on many units. So, what do they actually mean?

First of all, there are four distinct levels of 80+ power supplies:

  1. 80+bronze
  2. 80+silver
  3. 80+gold
  4. 80+platinum

They are indications of a quality-built power supply and, therefore,  should be considered buying.

These numbers have to do with how much electricity is drawn from the outlet is actually being converted into actual power at three specified loads (20%,50%, 100%) of the supper supply

  • An 80+bronze power supply (the lower tier of the four mentioned above) can convert 82% up to 85% from the outlet into actual power.
  • An 80+silver power supply can convert 85% up to 88% from the outlet into actual power.
  • An 80+gold power supply can convert 87% up to 90% from the outlet into actual power.
  • An 80+platinum  power supply can convert 90% up to 92% from the outlet into actual power.


As one goes up into the platinum category the prices go up significantly. A power supply’s rating has a significant impact on the electricity bill. As more energy is being converted into actual power, less electricity needs to be used and drawn in order to sustain the system’s power.

A typical consumer who is looking for a matching unit for his rig and does not use his computer 24/7 should be good to go with an 80+bronze power supply. However, a person who uses his Pc on a daily basis should consider paying some bucks more to get an 80+ gold certified power supply as he will be rewarded for his choice in the long run due to lower electricity costs



Here I will list a few excellent power supply units for those of you who are looking into buying one:

80+ bronze: Evga 600 B,  Corsair Cx 650w, Thermaltake Smart 650w

80+gold: Evga Supernova G3 650 w, Corsair RM650x 650w, Seasonic G-Series 650w

Those are just a few examples. If you don’t need 650 w delivery you can also look up the 550 w variations, but I would not recommend going lower than that.

I also want to show you an awesome tool, which lets you calculate your Pc’s power needs if you don’t know how much wattage you need. Check it out at this link:


I hope that you found this information helpful. If you have any questions or suggestions, please let me know in the comments below and I’ll make sure to answer as soon as possible.

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