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Power supplies (PSU) are often neglected when building a computer system. The power supply distributes the power to all the individual components within the PC, without it your PC would not run. The quality of components and technologies used to manufacture PSUs varies greatly. A poor quality power supply can greatly reduce the lifespan of your components, cause instability and even fail when overloaded. A high quality PSU will provide a more stable, more reliable system that will also produce less noise and heat. The higher quality power supplies will also operate more efficiently reducing your electricity bill and helping the environment. Remember not all power supplies are made equal.

Beginners Guide to Power Supplies

What is a Power Supply and why do I need one?

Power supplies (PSU) are often neglected when building a computer system.  The power supply distributes the power to all the individual components within the PC, without it your PC would not run.

Why is there a price difference between models with the same output?

The quality of components and technologies used to manufacture PSUs varies greatly. A poor quality power supply can greatly reduce the lifespan of your components, cause instability and even fail when overloaded. A high quality PSU will provide a more stable, more reliable system that will also produce less noise and heat. The higher quality power supplies will also operate more efficiently reducing your electricity bill and helping the environment. Remember not all power supplies are made equal.

What do the wattage ratings mean?

The wattage rating on a power supply can be deceptive as it shows the combined wattage across all the rails (basically all the connectors on the PSU are added up for the total power output). With the increased demands by components, the total required output for the +12V line has become increasingly important. A power supply should ideally have at least 18A available on the +12V line. The actual load you will need to get the most out of your components will vary depending on your system specifications.

What do power supply efficiency ratings and certifications mean?

If a supply loses less than 20% of the total power consumed, then it is considered ‘efficient’.  Look for the ‘80Plus’ sticker on modern PSUs. The benefits of more efficient power supplies are lower electricity bills, less harm to the environment and also due to less energy being wasted as heat a cooler and quieter operating PC. There are four 80Plus levels:-

- 80 PLUS Bronze: 81%+ efficient
- 80 PLUS Silver: 85%+ efficient
- 80 PLUS Gold: 88%+ efficient
- 80 PLUS Platinum: 90%+ efficient

What most people do not realise is the added benefit to a higher efficiency power supply is lower heat output. With less heat the fan on the PSU can keep temperature down  allowing for a cooler and quieter system overall.

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Corsair HX1200i 1200W Modular 80+ Platinum PSU
  • 12x Molex Connectors
  • 12x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
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CCL Code: PSU0877
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Part Number: CP-9020070-UK
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Manufacturer: Corsair
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Game Max GM600 600W Modular 80+ Platinum PSU
  • 3x Molex Connectors
  • 6x SATA Connectors
  • 2x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
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CCL Code: PSU1408
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Part Number: GM-600G
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Manufacturer: Game Max
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Corsair HXi Series 850W Modular 80+ Platinum PSU
  • 12x Molex Connectors
  • 12x SATA Connectors
  • 6x PCIe Connectors (6+2-Pin)
  • Modular Cable System
  • ATX Form Factor
  • More expected 22/11/2017
  • Free Delivery

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CCL Code: PSU0730
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Part Number: CP-9020073-UK
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Manufacturer: Corsair
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EVGA SuperNOVA 1200 P2 1200W Modular PSU
  • 5x Molex Connectors
  • 12x SATA Connectors
  • Modular Cable System
  • ATX Form Factor
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CCL Code: PSU1325
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Part Number: 220-P2-1200-X3
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Manufacturer: EVGA
EVGA SuperNOVA 750 P2 750W Modular PSU
  • 4x Molex Connectors
  • 10x SATA Connectors
  • Modular Cable System
  • ATX Form Factor
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£118.08 inc VAT

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CCL Code: PSU0923
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Part Number: 220-P2-0750-X3
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Manufacturer: EVGA
Seasonic Prime 850W Modular 80+ Platinum PSU
  • 5x Molex Connectors
  • 10x SATA Connectors
  • 6x PCIe Connectors (6+2-Pin)
  • Modular Cable System
  • ATX Form Factor
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£166.29 inc VAT

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CCL Code: PSU1486
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Part Number: SSR-850PD
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Manufacturer: Seasonic
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Corsair AX860 860W Modular 80+ Platinum PSU
  • 4x Molex Connectors
  • 12x SATA Connectors
  • 6x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
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CCL Code: PSU0529
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Part Number: CP-9020044-UK
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Manufacturer: Corsair
Seasonic Platinum 860 860W Modular PSU
  • 5x Molex Connectors
  • 10x SATA Connectors
  • Modular Cable System
  • ATX Form Factor
  • In Stock for 2-3 Day Delivery
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£146.99 inc VAT

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CCL Code: PSU1509
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Part Number: SS-860XP2
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Manufacturer: Seasonic
Be Quiet! Dark Power Pro 11 1200W Modular PSU
  • 7x Molex Connectors
  • 10x SATA Connectors
  • Modular Cable System
  • ATX Form Factor
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£234.99 inc VAT

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CCL Code: PSU0920
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Part Number: BN255
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Manufacturer: Be Quiet!
Antec High Current Pro HCP-1300 1300W Power Supply
  • 6 Molex Connectors
  • 9 SATA Connectors
  • 10 PCI-E Connectors (6+2-Pin)
  • 1 Floppy Type Connectors
  • Modular Cable System
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£268.90 inc VAT

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CCL Code: PSU0636
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Part Number: 0-761345-06261-9
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Manufacturer: Antec
Superflower Leadex Platinum 650W Modular PSU
  • 5x Molex Connectors
  • 10x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • Modular Cable System
  • ATX Form Factor
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CCL Code: PSU0931
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Part Number: SF-650F14MP black (UK)
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Manufacturer: Superflower
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Be Quiet! Dark Power Pro 11 650W Modular PSU
  • 5x Molex Connectors
  • 8x SATA Connectors
  • 4 + 4-Pin CPU Power Connector
  • Modular Cable System
  • ATX Form Factor
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£161.27 inc VAT

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CCL Code: PSU1513
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Part Number: BN251
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Manufacturer: Be Quiet!
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Corsair AX760 760W Modular 80+ Platinum PSU
  • 8x Molex Connectors
  • 12x SATA Connectors
  • 6x PCIe Connectors (6+2-Pin)
  • Modular Cable System
  • ATX Form Factor
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CCL Code: PSU0527
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Part Number: CP-9020045-UK
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Manufacturer: Corsair
Be Quiet! Dark Power Pro 11 1000W Modular PSU
  • 7x Molex Connectors
  • 10x SATA Connectors
  • Modular Cable System
  • ATX Form Factor
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£222.12 inc VAT

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CCL Code: PSU0919
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Part Number: BN254
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Manufacturer: Be Quiet!
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Seasonic Snow Silent 750W Modular 80+ Platinum PSU
  • 5x Molex Connectors
  • 10x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • Modular Cable System
  • ATX Form Factor
  • In Stock for 2-3 Day Delivery
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Was £182.69 - Save £14.84

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CCL Code: PSU1487
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Part Number: SS-750XP2 SNOW
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Manufacturer: Seasonic