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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.

Showing 1 - 20 of 29 Products

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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 stock expected around 23/01/2018

£148.87 inc VAT

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CCL Code: PSU0730
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Part Number: CP-9020073-UK
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Manufacturer: Corsair
Corsair HXi Series 750W Modular 80+ Platinum PSU
  • 8x Molex Connectors
  • 12x SATA Connectors
  • 6x PCIe Connectors (6+2-Pin)
  • Modular Cable System
  • ATX Form Factor
  • Sold out! Click Tell for stock updates

£131.09 inc VAT

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CCL Code: PSU0729
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Part Number: CP-9020072-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
  • ATX Form Factor
  • In Stock Now
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  • Free Delivery

Was £62.99 - Save £8.56

Now only £54.43 inc VAT

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CCL Code: PSU1408
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Part Number: GM-600G
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Manufacturer: Game Max
Be Quiet! Dark Power Pro 11 1000W Modular PSU
  • 7x Molex Connectors
  • 10x SATA Connectors
  • Modular Cable System
  • ATX Form Factor
  • More expected 18/01/2018
  • Free Delivery

£255.99 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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Aero Cool Project 7 P750 750W Modular PSU
  • 6x Molex Connectors
  • 8x SATA Connectors
  • 6x PCIe Connectors (6+2-Pin)
  • Modular Cable System
  • ATX Form Factor
  • In Stock Now
  • Pickup Now
  • Free Delivery

Was £149.99 - Save £10.01

Now only £139.98 inc VAT

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CCL Code: PSU1464
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Part Number: ACPP-P775FKC.11
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Manufacturer: Aero Cool
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
  • Order for Pickup in 1-2 Days
  • Free Delivery

£145.59 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 650W Modular PSU
  • 5x Molex Connectors
  • 8x SATA Connectors
  • 4 + 4-Pin CPU Power Connector
  • Modular Cable System
  • ATX Form Factor
  • In Stock for 2-3 Day Delivery
  • Order for Pickup in 1-2 Days
  • Free Delivery

£139.08 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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Aero Cool Project 7 P650 650W Modular PSU
  • 6x Molex Connectors
  • 8x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • Modular Cable System
  • ATX Form Factor
  • In Stock Now
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  • Free Delivery

Was £134.99 - Save £10.00

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CCL Code: PSU1463
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Part Number: ACPP-P765FKC.11
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Manufacturer: Aero Cool
Be Quiet! Dark Power Pro 11 850W Modular PSU
  • 7x Molex Connectors
  • 8x SATA Connectors
  • Modular Cable System
  • ATX Form Factor
  • In Stock for Next Day Delivery
  • Order for Pickup in 1-2 Days
  • Free Delivery

£188.48 inc VAT

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CCL Code: PSU0918
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Part Number: BN253
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Manufacturer: Be Quiet!
Antec HCP-1000 1000W Modular 80+ Platinum PSU
  • 6x Molex Connectors
  • 9x SATA Connectors
  • 6x PCIe Connectors (6+2-Pin)
  • Modular Cable System
  • ATX Form Factor
  • Sold out! Click Tell for stock updates

£218.36 inc VAT

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CCL Code: PSU0626
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Part Number: 0-761345-06249-7
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Manufacturer: Antec
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Aero Cool Project 7 P850 850W Modular PSU
  • 6x Molex Connectors
  • 10x SATA Connectors
  • 6x PCIe Connectors (6+2-Pin)
  • Modular Cable System
  • ATX Form Factor
  • In Stock Now
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  • Free Delivery

Was £164.99 - Save £9.99

Now only £155.00 inc VAT

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CCL Code: PSU1465
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Part Number: ACPP-P785FKC.11
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Manufacturer: Aero Cool
Seasonic Prime 750W Modular 80+ Platinum PSU
  • 3x Molex Connectors
  • 8x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • Modular Cable System
  • ATX Form Factor
  • In Stock for 2-3 Day Delivery
  • Order for Pickup in 1-2 Days
  • Free Delivery

£158.55 inc VAT

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CCL Code: PSU1483
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Part Number: SSR-750PD
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Manufacturer: Seasonic
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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
  • In Stock for 2-3 Day Delivery
  • Order for Pickup in 1-2 Days
  • Free Delivery

Was £175.02 - Save £7.93

Now only £167.09 inc VAT

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CCL Code: PSU0527
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Part Number: CP-9020045-UK
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Manufacturer: Corsair
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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
  • In Stock for 2-3 Day Delivery
  • Order for Pickup in 1-2 Days
  • Free Delivery

Was £186.24 - Save £14.03

Now only £172.21 inc VAT

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CCL Code: PSU0529
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Part Number: CP-9020044-UK
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Manufacturer: Corsair
Inwin C750 750W Modular 80+ Platinum PSU
  • 6x Molex Connectors
  • 9x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for 2-3 Day Delivery
  • Order for Pickup in 1-2 Days
  • Free Delivery

£151.86 inc VAT

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CCL Code: PSU1457
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Part Number: C750
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Manufacturer: Inwin
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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 £15.89

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CCL Code: PSU1487
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Part Number: SS-750XP2 SNOW
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Manufacturer: Seasonic
EVGA SuperNOVA 650 P2 650W Modular PSU
  • 6x Molex Connectors
  • 9x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • Modular Cable System
  • ATX Form Factor
  • Sold out! Click Tell for stock updates

£119.99 inc VAT

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CCL Code: PSU0954
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Part Number: 220-P2-0650-X3
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Manufacturer: EVGA
EVGA SuperNOVA 850 P2 850W Modular PSU
  • 4x Molex Connectors
  • 10x SATA Connectors
  • Modular Cable System
  • ATX Form Factor
  • More stock expected around 30/01/2018

£133.57 inc VAT

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CCL Code: PSU0924
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Part Number: 220-P2-0850-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
  • Sold out! Click Tell for stock updates

£144.22 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