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The power supply is used to process the input voltage from the power grid, transform it and divide it into power supply branches. The output of the power supply is several voltage levels distributed through different connectors. Do you know what parameters to look for when choosing a PC power supply? We will advise you.
ContinueThe computer power supply can be divided into five main categories.
ATX power supply is the most common type. It is aimed for basic use, nothing special – if you do not aim to use your computer for gaming, crypto mining or PC tuning, this PSU type will do for you. If you're looking to power your compact office machine, you'll be probably more interested in SFX PC power supply – a space-saving little brother of ATX.
A gaming power supply offers great power, usually in the range of 400 up to 2 000 W. In most cases, you can expect this PSU to be ATX format, thanks to which they will fit into a wide range of PC cases and provide enough power for all gaming components. Gaming power supplies usually contain more connectors to power up multiple graphics cards or SSDs or HDDs.
Power supply for crypto mining provides similar or higher power than gaming PSU. The crucial difference is a higher number of PCI-E connectors to power more graphics cards simultaneously.
See more components for crypto mining in a specialised section on Crypto Mining.
The PC tuning PSU is in demand mostly for aesthetic reasons. Usually, these are quiet PC power supplies that are suitable for PC cases with RGB lighting. The PC tuning power supply usually comes with suitable cable management equipment.
Modular PSU are usually different to other power supplies in that they come with detachable cables, thanks to which you gain a full control over your PC case. Modular cables can help air circulation and with that, they reduce dusting and high temperatures.
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Passively cooled PC power supplies do not have a fan. They are cooled just by air circulation. They are ideal for less powerful office computers that do not produce much heat.
The best way to go about choosing an appropriate power supply is to follow a few simple rules given below.
The power of PCs is usually measured in Watts. Each component of your machine takes up a certain amount of these Watts. The table below shows an approximation of the required power. For a more accurate calculation of total power required, go to the computer power supply power requirements calculator at outervision.com.
Type | Use |
---|---|
PSU up to 350W | Office computers |
PSU 400-450W | Gaming PC and lower-power machines |
PSU 500-550W | Gaming PC and mid-range workstations |
PSU 600-650W | Gaming PC and higher-range workstations |
PSU 700-900W | Gaming PC and top-performance workstations |
PSU more than 1000W | Crypto mining PCs, servers |
While the usual weapon of choice for gaming PCs are 600W or 750W power supplies, standard office will be perfectly happy with 400W or 500W PC power supply. You can read more about this in our article on how to build a PC, where you will find all the dos and don'ts of how to build a new PC, should you find the courage to build your PC on your own. If you trust experts more, we can build your dream machine for you.
The format defines the dimensions of the power supply. The use of different formats is tied with different PC case sizes. The four main types are:
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See the power supply unit accessories section for power surge protection, backup power supplies and more useful accessories.
The efficiency parameter determines how much power is lost due to heat and how much power is sent to the components of your PC. 80 PLUS certification indicates which PC power supplies are 80 % and more efficient. The table below shows efficiency with the respective degrees of power load.
Power load type | Efficiency at 50% load | Efficiency at 100% load |
---|---|---|
80 PLUS | 85% | 82% |
80 PLUS Bronze | 88% | 85% |
80 PLUS Silver | 90% | 87% |
80 PLUS Gold | 92% | 89% |
80 PLUS Platinum | 94% | 90% |
80 PLUS Titanium | 96% | 94% |
We recommend selecting your PC power supply according to its typical power load, which is usually 50 %. Power supplies with high efficiency will show the bigger difference in performance with high-power PCs used several hours non-stop daily.
Every PSU has input connectors that must correspond to the respective component on the motherboard. When buying, always look at the number of connectors required by your motherboard first, then search for the appropriate power supply.
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Want to use more graphics cards at the same time? Check that they are equipped with CrossFire or SLI technology and that you have a sufficient number of PCI-E busses.
Many PCs are equipped with several failsafe solutions to help prolong their lifespan.
PFC or power supply factor correction ensures levelling of the power consumption stream and the adjustment of the flow. The target is to prevent overloading or unbalanced power. There are two types of PFC:
Computer power supplies are standardized according to the ATX format, created in 1995 by Intel as a standard arrangement of components in computer cases. At that time, it replaced the older standard AT format. In 2003, Intel tried to replace it with BTX, but manufacturers did not switch to that format and instead ATX was revised several times. The latest and current versions are ATX2.2, and smaller formats mATX and Mini ITX.
As the ATX format developed, there were also changes in power supply - ie, in the area of computer resources. Therefore, it is now using ATX power supply for computer assembly versions 2.0, 2.2, 2.3 and 2.4 which differ in the main power connector, which plugs into the motherboard. It is therefore necessary for you to match the selected source to a version compatible with the motherboard.
When deciding which power source to buy, it is important to know the overall performance specification (given in watts and must be sufficient for the computer system - eg. For desktop computers 350-400 W is sufficient), cooling type and the amount and variation of additional power connectors.
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