Select the item on the page that has the error
We use cookies to give you the best possible experience on our site. By continuing to use the site you agree to our use of cookies. Find out more

PC Power Supplies

0
How to build your own PC in 8 steps (DETAILED GUIDE) Building your own PC can be tricky. That is why we have prepared a detailed GUIDE for you that should make...

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.

Continue

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.

Was this information useful?
This form is for collecting Feedback Only. If you have any other inquiries, please our Customer Care team here.
Is something missing or displayed incorrectly? Let us know your suggestions so we can improve the website and customer experience.

Best Deals

1.
EVGA SuperNOVA 550 G3 In stock > 5 pcs
PC Power Supply - 550W, 80 Plus Gold, 130mm fan with hydrodynamic bearings, modular cabling
£72.90

2.
Seasonic M12II-620 Evo In stock > 5 pcs
PC Power Supply - 620W, ATX, 80 Plus Bronze, Active PFC, 4x PCIe, 8x SATA, 5x Molex, 120mm silent fan, modular cables
-10%
£72.50
£64.90

3.
Corsair CX550M In stock > 5 pcs
PC Power Supply - 550W, 80 Plus Bronze, ATX2.3, active PFC, 120mm fan
£55.90

More Bestsellers
123 ...
226 Results
Classic Range
Seasonic M12II-620 Evo
PC Power Supply - 620W, ATX, 80 Plus Bronze, Active PFC, 4x PCIe, 8x SATA, 5x Molex, 120mm silent fan, modular cables

Seasonic M12II-620 Evo - PC Power Supply
-10%
£64.90

-10% £72.50
excl.VAT £54.08

In stock > 5 pcs
Order Code: UE313h4e
Deluxe Range
EVGA SuperNOVA 850 G3
PC Power Supply - 850W, 80 Plus Gold, 130mm fan with hydrodynamic bearings, modular cabling

£124.61

excl.VAT £103.84

In stock > 5 pcs
Order Code: EV206q91a
Premium Range
Corsair HX1000
PC Power Supply - ATX, 1000W, 80 Plus Platinum, 8x SATA, 8x PCIe, modular cables, 135mm fan

£172.90

excl.VAT £144.08

In stock > 5 pcs
Order Code: UY006v3
Corsair VS450 EU-024
Power Supply – 450W, ATX, 120mm thermally controlled fan

£35.90

excl.VAT £29.92

In stock > 5 pcs
Order Code: UY006p2
EVGA SuperNOVA 550 G3
PC Power Supply - 550W, 80 Plus Gold, 130mm fan with hydrodynamic bearings, modular cabling

£72.90

excl.VAT £60.75

In stock > 5 pcs
Order Code: EV206q6c
Corsair CX550M
PC Power Supply - 550W, 80 Plus Bronze, ATX2.3, active PFC, 120mm fan

£55.90

excl.VAT £46.58

In stock > 5 pcs
Order Code: UY000a4e
Seasonic S12II-620
PC Power Supply - 620 W, ATX 2.3, 80 Plus Bronze, Active PFC, 2x PCIe, 9x SATA 120mm silent fan

Seasonic S12II-620 - PC Power Supply
-18%
£54.90

-18% £67
excl.VAT £45.75

In stock 1 pcs
Order Code: UE312l4
Fortron SP500-A
PC Power Supply - ATX, 450W, active PFC, 1x PCIe, 4x SATA, 120mm fan, power cable not included

Fortron SP500-A - PC Power Supply
-19%
£27.90

-19% £34.50
excl.VAT £23.25

Price Massacre
In stock > 5 pcs
Order Code: UD949a8j
Corsair VS350
Power Supply – 350W, ATX, 120mm fan

£30.90

excl.VAT £25.75

In stock > 5 pcs
Order Code: UY006o1
Seasonic Prime Ultra 850 W Titanium
PC Power Supply - 850W, ATX 2.4, 80 Plus Titanium, active PFC, 6x PCIe, 10x SATA, 135mm silent fan, fully modular cables

£208.90

excl.VAT £174.08

In stock > 5 pcs
Order Code: UE313k2c1
Seasonic Focus Plus 750 Gold
PC Power Supply - 750W, ATX, 80 Plus Gold, active PFC, 4x PCIe, 8x SATA, 120mm silent fan, fully modular cables

£100.90

excl.VAT £84.08

In stock > 5 pcs
Order Code: UE313s2
Corsair VS550
Power Supply – 550W, ATX, 120mm thermally controlled fan

£39.90

excl.VAT £33.25

Last piece in stock
Order Code: UY006q2
CORSAIR TX850M
PC Power Supply - ATX, 850W, 80 Plus Gold, 8x SATA, 4x PCIe, Semi-Modular Cables, 140mm Fan

£100.90

excl.VAT £84.08

In stock > 5 pcs
Order Code: UY006t5c
EVGA SuperNOVA 1300 G2
PC Power Supply - 1300W, 80 Plus Gold, 140mm fan, ultra-silent fan design

£221.90

excl.VAT £184.92

Special Offer
In stock > 5 pcs
Order Code: EV300h4a
EVGA 450 B3
PC Power Supply - 450W, 80 Plus Bronze, 130mm fan, modular cabling

£46.90

excl.VAT £39.08

In stock > 5 pcs
Order Code: EV300k5b
Corsair RM850i
Power Supply – 850W, 80 Plus Gold, ATX, Fully modular, 135mm fan, Zero RPM fan mode at low to medium loads

£134.90

excl.VAT £112.42

In stock > 5 pcs
Order Code: UY006s5b
EVGA SuperNova 750 G3
PC Power Supply - 750W, 80 Plus Gold, 130mm fan with hydrodynamic bearings, modular cabling

£100.90

excl.VAT £84.08

Special Offer
In stock > 5 pcs
Order Code: EV206q80b
Corsair RM1000x
PC Power Supply - ATX, 1000W, 80 Plus Gold, 11x SATA, modular cables, 135mm fan

£167.90

excl.VAT £139.92

In stock > 5 pcs
Order Code: UY006u1e
Corsair RM650i
Power Supply – 650W, 80 Plus Gold, ATX, Fully modular, 135mm fan, Zero RPM fan mode at low to medium loads

£110.90

excl.VAT £92.42

In stock 5 pcs
Order Code: UY006s3a
EVGA SuperNova 650 G3
PC Power Supply - 650W, 80 Plus Gold, 130mm fan with hydrodynamic bearings, modular cabling

£83.90

excl.VAT £69.92

In stock > 5 pcs
Order Code: EV206q7c
EVGA 600W
PC Power Supply - 80 Plus, 120mm fan, ultra-quiet fan design

£42.90

excl.VAT £35.75

In stock > 5 pcs
Order Code: EV300j2a
Corsair CX450M
PC Power Supply - 450W, 80 Plus Bronze, ATX2.3, active PFC, 120mm fan

£48.90

excl.VAT £40.75

In stock > 5 pcs
Order Code: UY000a2b
Corsair SF600
PC Power Supply - SFX, 600W, 80 Plus Gold, 4x SATA, modular cables, 92mm fan

£97.90

excl.VAT £81.58

In stock 3 pcs
Order Code: UY006t4b
Corsair RM750i
Power Supply – 750W, 80 Plus Gold, ATX, Fully modular, 135mm fan, zero rpm fan mode at low to medium loads

£117.90

excl.VAT £98.25

In stock > 5 pcs
Order Code: UY006s4b
24 more... Top
123 ...
 

PC Power Supplies

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.

Was this information useful?
This form is for collecting Feedback Only. If you have any other inquiries, please our Customer Care team here.
Is something missing or displayed incorrectly? Let us know your suggestions so we can improve the website and customer experience.

Enter product name

Note (link, Part number etc.):

2 days ago bought by company, STOKE ON TRENT
3 days ago bought by company, GLOSSOP
3 days ago bought by company, Leicester
5 days ago bought by company, Havant
6 days ago bought by company, Tottenham


Why buy from us? We offer a 2-Month Return Service as an optional extra on most products More info »
My Alza Log In Shipping & Payment About Us
Shipping to:
WEB18

Why buy from us? We offer a 2-Month Return Service as an optional extra on most products More info »
Your personal assistant
Alza Premium
Rád pro vás zjistím stav objednávky či pomohu s výběrem zboží.
Napsat dotaz
Zavolejte mi
New conversation
We will call you and advise you professionally
+420 225 340 120
Order inquiry
Question about the product
Please enter your telephone:
Call me