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PC Power Supplies

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.

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Power Output

The 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.

PerformanceUseConfiguration Example *
to 349GBLower class office and gaming computersIntel Core i3, NVIDIA GeForce GTX 1050
350 to 499WMiddle-class gaming machinesIntel Core i5, NVIDIA GeForce GTX 1050 Ti
500 to 599WMid-range gaming machinesIntel Core i5 (K), NVIDIA GeForce GTX 1060 / GTX 1070
600 to 799WHigh-end gaming machinesIntel Core i7 (K), NVIDIA GeForce GTX 1080 / GTX 1080 Ti
800W or moreHigh-end gaming computers, workstations, serversIntel 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.

Format of the PC Power Source

The format defines the physical dimensions of the computer source. The use of different formats is linked to different cases.

  • ATX - ATX is the standard format used for most desktops.
  • SFX - A small-sized computer source designed for Mini-ITX cabinets.
  • TFX - This is an alternative format for small computer assemblies. The connectors meet the ATX standard.
  • Other - In this category you will find computer sources of various dimensions and for different focuses. From specialised server resources to low-power adapters for small computers.
Source FormatDepthLengthHeight
ATX140mm150mm86mm
SFX100mm125mm63.5mm
TFX175mm85mm65mm

Equipment for a Computer Source

  • Detachable cables - Some computer sources have a modular plug-in, allowing you to connect only the ones you really need. The result is better cable organisation, resulting in a cleaner look and better airflow.
  • Passive cooling - passively cooled sources do not contain a fan, they are cooled only by natural air flow, which can be potentially unhealthy for the system. Such sources, however, generally have limited performance. Some of the more powerful sources are able to passively cool down at low load, when higher they then activate a fan.
  • Active PFC - PFCs, or power factor correction power supplies smooth out current consumption and adjust the amount of power from the power supply. The aim is to prevent overload and voltage fluctuations. Active PFC for compensation uses a dedicated circuit and is a more expensive but better solution.
  • Passive PFCs - passive PFCs have the same task in a computer source as the active PFC, but they use a more common capacitive filter that reduces the cost but also the quality of the compensation. Passive PFCs can only be found in the cheapest sources.
  • Thermal speed control - thermal speed control is available in the vast majority of computer power sources. Its aim is to adjust the temperature rpm. The more heat that is generated, the faster the fan goes in order to maintain safe temperatures, while keeping the silent running.
  • The network switch - the power switch is familiar to everyone. It is a small two-state switch on the back of the power supply that can interrupt the power supply to a computer source.

Effectiveness of PC Power Sources

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.

CertificationEfficiency*
80 PLUS85%
80 PLUS Bronze88%
80 PLUS Silver90%
80 PLUS Gold92%
80 PLUS Platinum94%
80 PLUS Titanium96%

*The values are calculated at 50% capacity at which the efficiency is highest.

Power Source Connectors

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.

Specific values of the voltage levels at the outputs are 3.3V, 5V and 12V.

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.

Fan Size

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.

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163 Results
Classic Range
Corsair CV450 - PC Power Supply
More than98%reliability
Corsair CV450
PC Power Supply - 450W, ATX, 80 PLUS Bronze, efficiency of 88%, 2 piece(s) PCIe (8-pin / 6+2-pin), 7 × SATA, active PFC, thermal speed control and power switch, 120mm fan, depth of 125mm

Predicted Price
£38.90 excl.VAT £32.42
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Deluxe Range
Corsair TX650M - PC Power Supply
More than99%reliability
Corsair TX650M
PC Power Supply - 650W, ATX, 80 PLUS Gold, efficiency of 90%, 4 piece(s) PCIe (8-pin / 6+2-pin), 6 × SATA, detachable cables, active PFC and power switch, 120mm fan, semi modular, depth of 140mm

Predicted Price
£85.90 excl.VAT £71.58
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Premium Range
Corsair RM850x (2018)
PC Power Supply - 850W, ATX, 80 PLUS Gold, 6 piece(s) PCIe (8-pin / 6+2-pin), 10 × SATA, detachable cables, active PFC, thermal speed control, power switch and zero RPM mode, 135mm fan, full modular, depth of 160mm

Predicted Price
£146.90 excl.VAT £122.42
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Order Code: UY006u1d2
Corsair RM650x (2018) - PC Power Supply
More than98%reliability
Corsair RM650x (2018)
PC Power Supply - 650W, ATX, 80 PLUS Gold, 4 piece(s) PCIe (8-pin / 6+2-pin), 9 × SATA, detachable cables, active PFC, thermal speed control, power switch and zero RPM mode, 140mm fan, full modular, depth of 160mm

Predicted Price
£106.90 excl.VAT £89.08
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Order Code: UY006u1b2
Corsair CX650F RGB White
PC Power Supply - 650W, ATX, 80 PLUS Bronze, efficiency of 90%, 4 piece(s) PCIe (8-pin / 6+2-pin), 7 × SATA, thermal speed control, power switch, zero RPM mode, RGB backlight and DC-DC converters, 120mm fan, full modular, depth of 140mm

Predicted Price
£83.90 excl.VAT £69.92
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Order Code: UY006c65rw
Corsair RM550x (2018) - PC Power Supply
-5%
More than98%reliability
Corsair RM550x (2018)
PC Power Supply - 550W, ATX, 80 PLUS Gold, efficiency of 89%, 2 piece(s) PCIe (8-pin / 6+2-pin), 6 × SATA, detachable cables, active PFC, thermal speed control, power switch and zero RPM mode, 140mm fan, full modular, depth of 160mm

-5% £92.90 Predicted Price
£87.90 excl.VAT £73.25
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Order Code: UY006u1a2
Fractal Design ION + 560P
PC Power Supply - 560W, ATX, 80 PLUS Platinum, 4 piece(s) PCIe (8-pin / 6+2-pin), 6 × SATA, detachable cables, heatsink, thermal speed control, power switch and zero RPM mode, 140mm fan, full modular, depth of 150mm

Predicted Price
£104.90 excl.VAT £87.42
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Order Code: CB320l5h
Seasonic Focus GX 550W Gold - PC Power Supply
-17%
More than98%reliability
Seasonic Focus GX 550W Gold
PC Power Supply - 550W, ATX, 80 PLUS Gold, efficiency of 88%, 2 piece(s) PCIe (8-pin / 6+2-pin), 4 × SATA, detachable cables, active PFC, thermal speed control, power switch and zero RPM mode, 120mm fan, full modular, depth of 140mm

-17% £92.90 Predicted Price
£76.90 excl.VAT £64.08
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Order Code: UE314gx55
Corsair CV650
PC Power Supply - 650W, ATX, 80 PLUS Bronze, efficiency of 88%, 2 piece(s) PCIe (8-pin / 6+2-pin), 7 × SATA, active PFC, thermal speed control and power switch, 120mm fan, depth of 125mm

Predicted Price
£58.90 excl.VAT £49.08
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Order Code: UY006n1c
Corsair TX550M - PC Power Supply
-12%
More than99%reliability
Corsair TX550M
PC Power Supply - 550W, ATX, 80 PLUS Gold, 2 piece(s) PCIe (8-pin / 6+2-pin), 5 × SATA, detachable cables, active PFC and power switch, 120mm fan, semi modular, depth of 140mm

-12% £76.67 Predicted Price
£67.80 excl.VAT £56.50
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Order Code: UY004e1
Corsair VS350 - PC Power Supply
More than98%reliability
Corsair VS350
PC Power Supply - 350W, ATX, 80 PLUS, efficiency of 85%, 1 piece(s) PCIe (8-pin / 6+2-pin), 4 × SATA, active PFC and power switch, 120mm fan, depth of 140mm

Predicted Price
£35.90 excl.VAT £29.92
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Order Code: UY006o1
SilentiumPC Supremo FM2 Gold 750W - PC Power Supply
-8%
More than98%reliability
SilentiumPC Supremo FM2 Gold 750W
PC Power Supply - 750W, ATX, 80 PLUS Gold, 4 piece(s) PCIe (8-pin / 6+2-pin), 9 × SATA, detachable cables, active PFC and power switch, 120mm fan, full modular

-8% £104.90 Predicted Price
£96.90 excl.VAT £80.75
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Order Code: SPC169
SilentiumPC Supremo FM2 Gold 650W - PC Power Supply
More than98%reliability
SilentiumPC Supremo FM2 Gold 650W
PC Power Supply - 650W, ATX, 80 PLUS Gold, 4 piece(s) PCIe (8-pin / 6+2-pin), 9 × SATA, detachable cables, active PFC, thermal speed control and power switch, 120mm fan, full modular

Predicted Price
£90.90 excl.VAT £75.75
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Order Code: SPC168
Seasonic Focus Plus 650 Platinum - PC Power Supply
More than98%reliability
Seasonic Focus Plus 650 Platinum
PC Power Supply - 650W, ATX, 80 PLUS Platinum, efficiency of 89%, 4 piece(s) PCIe (8-pin / 6+2-pin), 8 × SATA, detachable cables, active PFC, thermal speed control, power switch and zero RPM mode, 120mm fan, full modular, depth of 140mm

Predicted Price
£135.90 excl.VAT £113.25
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Order Code: UE313s4
Seasonic Prime Ultra 650W Titanium - PC Power Supply
-8%
More than98%reliability
Seasonic Prime Ultra 650W Titanium
PC Power Supply - 650W, ATX, 80 PLUS Titanium, 4 piece(s) PCIe (8-pin / 6+2-pin), 6 × SATA, detachable cables, active PFC, thermal speed control, power switch and zero RPM mode, 135mm fan, full modular, depth of 170mm

-8% £178.90 Predicted Price
£163.90 excl.VAT £136.58
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Order Code: UE313k2a
SilentiumPC Vero M3 Bronze 600W
PC Power Supply - 600W, ATX, 80 PLUS Bronze, efficiency of 89%, 2 piece(s) PCIe (8-pin / 6+2-pin), 7 × SATA, detachable cables, active PFC, thermal speed control, power switch and DC-DC converters, 120mm fan, semi modular, depth of 160mm

Predicted Price
£62.90 excl.VAT £52.42
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Order Code: SPCvm3b600
Seasonic Core GC 650W Gold - PC Power Supply
More than98%reliability
Seasonic Core GC 650W Gold
PC Power Supply - 650W, ATX, 80 PLUS Gold, efficiency of 90%, 2 piece(s) PCIe (8-pin / 6+2-pin), 6 × SATA, active PFC, thermal speed control and power switch, 120mm fan, depth of 140mm

Predicted Price
£81.90 excl.VAT £68.25
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Order Code: UE312l2e
Seasonic Focus Plus 550 Platinum - PC Power Supply
More than98%reliability
Seasonic Focus Plus 550 Platinum
PC Power Supply - 550W, ATX, 80 PLUS Platinum, efficiency of 89%, 2 piece(s) PCIe (8-pin / 6+2-pin), 6 × SATA, detachable cables, active PFC, thermal speed control, power switch and zero RPM mode, 120mm fan, full modular, depth of 140mm

Predicted Price
£111.90 excl.VAT £93.25
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Order Code: UE313s3
Seasonic Focus GX 650W Gold - PC Power Supply
More than98%reliability
Seasonic Focus GX 650W Gold
PC Power Supply - 650W, ATX, 80 PLUS Gold, efficiency of 88%, 4 piece(s) PCIe (8-pin / 6+2-pin), 10 × SATA, detachable cables, active PFC, thermal speed control, power switch and zero RPM mode, 120mm fan, full modular, depth of 140mm

Predicted Price
£108.90 excl.VAT £90.75
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Order Code: UE314gx65
Corsair SF450 (2018)
PC Power Supply - 450W, SFX, 80 PLUS Platinum, efficiency of 92%, 2 piece(s) PCIe (8-pin / 6+2-pin), 4 × SATA, detachable cables, active PFC, thermal speed control, power switch and zero RPM mode, 92mm fan, full modular, depth of 100mm

Predicted Price
£102.90 excl.VAT £85.75
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Order Code: UY006t4a1
Seasonic Focus GX 750W Gold - PC Power Supply
-9%
More than98%reliability
Seasonic Focus GX 750W Gold
PC Power Supply - 750W, ATX, 80 PLUS Gold, efficiency of 90%, 4 piece(s) PCIe (8-pin / 6+2-pin), 10 × SATA, detachable cables, active PFC, thermal speed control, power switch and zero RPM mode, 120mm fan, full modular, depth of 140mm

-9% £135.90 Predicted Price
£123.90 excl.VAT £103.25
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Order Code: UE314gx75
SilverStone SFX Bronze ST45SF 3.0 450W
PC Power Supply - 450W, SFX, 80 PLUS Bronze, efficiency of 85%, 1 piece(s) PCIe (8-pin / 6+2-pin), 1 × PCIe (6-pin), 3 × SATA, active PFC, thermal speed control and power switch, 92mm fan, depth of 100mm

Predicted Price
£66.90 excl.VAT £55.75
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Order Code: UB090k1b
SilentiumPC Supremo M2 Gold 550W V2 - PC Power Supply
More than99%reliability
SilentiumPC Supremo M2 Gold 550W V2
PC Power Supply - 550W, ATX, 80 PLUS Gold, 2 piece(s) PCIe (8-pin / 6+2-pin), 7 × SATA, detachable cables, active PFC, thermal speed control and power switch, 120mm fan, semi modular

Predicted Price
£79.90 excl.VAT £66.58
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Order Code: SPC140
GIGABYTE P450B
PC Power Supply - 450W, ATX, 80 PLUS Bronze, efficiency of 85%, 2 piece(s) PCIe (8-pin / 6+2-pin), 6 × SATA, active PFC, thermal speed control and power switch, 120mm fan, no modular, depth of 140mm

Predicted Price
£35.90 excl.VAT £29.92
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Ordered on request
Order Code: GBZ004
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PC Power Supplies

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PC Power Supplies

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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