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The purpose of a PC power source is to process the input voltage from the power supply, to transform it and to divide it into supply branches. The output of the source is several voltage levels distributed through different connectors. Find out more below.
ContinueThe power output indicates the maximum amount of Watts that the power supply can continuously supply to the components within the computer. In the following table, you will find the source supply in different systems.
Performance | Use | Configuration Example * |
to 349GB | Lower class office and gaming computers | Intel Core i3, NVIDIA GeForce GTX 1050 |
350 to 499W | Middle-class gaming machines | Intel Core i5, NVIDIA GeForce GTX 1050 Ti |
500 to 599W | Mid-range gaming machines | Intel Core i5 (K), NVIDIA GeForce GTX 1060 / GTX 1070 |
600 to 799W | High-end gaming machines | Intel Core i7 (K), NVIDIA GeForce GTX 1080 / GTX 1080 Ti |
800W or more | High-end gaming computers, workstations, servers | Intel Core i7 (K), 2 × GTX 1080 Ti SLI |
*These numbers are only estimations, the power consumption of processors may vary across generations. Other components are included in the total computer consumption.
The format defines the physical dimensions of the computer source. The use of different formats is linked to different cases.
Source Format | Depth | Length | Height |
ATX | 140mm | 150mm | 86mm |
SFX | 100mm | 125mm | 63.5mm |
TFX | 175mm | 85mm | 65mm |
Efficiency is a parameter that indicates the percentage of electrical energy from a network that is used and divided between the components. The remaining percentages represent the amount of energy that is lost, which is given off as heat.
Although you can select a source directly based on the value of efficiency, it is better to use a standardised distribution using 80 PLUS certifications.
Certification | Efficiency* |
80 PLUS | 85% |
80 PLUS Bronze | 88% |
80 PLUS Silver | 90% |
80 PLUS Gold | 92% |
80 PLUS Platinum | 94% |
80 PLUS Titanium | 96% |
*The values are calculated at 50% capacity at which the efficiency is highest.
Each source has output connectors that must match their counterpart on the motherboard. When purchasing a power source, first look at what connectors your board requires, and then you can filter out which ones you don't want.
The motherboard's main power supply runs through a 20-pin or 24-pin connector, while the additional processor power is provided by the ATX 4-pin connector or 8-pin EPS connector.
The power-intensive graphics card connection in the PCIe slot takes care of the same marked 6-pole or 8-pin power connector.
The 15-pin SATA connector serves to power all the relatively modern disks communicating through the SATA III interface. 4-pole Molex connectors, on the other hand, mount older HDDs, their reduced versions then FDD. Molex is the most commonly used connector on your computer, and a number of plug-and-play connectors for it can be used to connect any of the above-standard internal computer equipment.
The size of the fan of the computer source is mainly a consideration for the noise it generates. A larger fan can rotate slower to ensure the same air flow, reducing noise and increasing lifespan.
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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