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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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Be Quiet! Pure Power 10 300W 80+ Bronze PSU
  • 2x Molex Connectors
  • 4x SATA Connectors
  • 1x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for 2-3 Day Delivery
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£40.49 inc VAT

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CCL Code: PSU1386
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Part Number: BN270
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Manufacturer: Be Quiet!
Cougar GX-S 550W 80+ Gold PSU
  • 3x Molex Connectors
  • 5x SATA Connectors
  • 2x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for 2-3 Day Delivery
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£61.99 inc VAT

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CCL Code: PSU1367
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Part Number: GX-S550
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Manufacturer: Cougar
Cougar GX-S 650W 80+ Gold PSU
  • 3x Molex Connectors
  • 8x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
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£69.95 inc VAT

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CCL Code: PSU1368
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Part Number: GX-S650
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Manufacturer: Cougar
Be Quiet! Pure Power 10 600W 80+ Silver PSU
  • 3x Molex Connectors
  • 6x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
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  • Free Delivery

£69.98 inc VAT

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CCL Code: PSU1390
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Part Number: BN274
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Manufacturer: Be Quiet!
Antec VPF650 650W 80+ Bronze PSU
  • 3x Molex Connectors
  • 5x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
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£73.71 inc VAT

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CCL Code: PSU1297
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Part Number: 0-761345-06463-7
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Manufacturer: Antec
BitFenix Whisper M 550W Modular 80+ Gold PSU
  • 4x Molex Connectors
  • 8x SATA Connectors
  • 2x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for 2-3 Day Delivery
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£82.99 inc VAT

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CCL Code: PSU1430
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Part Number: BP-WG550UMAG-8FM
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Manufacturer: BitFenix
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Be Quiet! Pure Power 10 CM 700W Modular PSU
  • 3x Molex Connectors
  • 6x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
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Was £97.01 - Save £11.83

Now only £85.18 inc VAT

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CCL Code: PSU1395
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Part Number: BN279
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Manufacturer: Be Quiet!
Be Quiet! Straight Power 10 600W 80+ Gold PSU
  • 3x 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
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£91.98 inc VAT

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CCL Code: PSU0900
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Part Number: BN232
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Manufacturer: Be Quiet!
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Be Quiet! Power Zone 750W 80+ Bronze PSU
  • 4x Molex Connectors
  • 8x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
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Was £134.77 - Save £29.78

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CCL Code: PSU0640
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Part Number: BN211
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Manufacturer: Be Quiet!
Cooler Master V650 650W Modular 80+ Gold PSU
  • 6x Molex Connectors
  • 8x SATA Connectors
  • 2x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
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£112.80 inc VAT

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CCL Code: PSU0945
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Part Number: RS650-AFBAG1-UK
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Manufacturer: Cooler Master
Antec Edge 650W Modular 80+ Gold 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 Next Day Delivery
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£113.17 inc VAT

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CCL Code: PSU0733
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Part Number: 0-761345-05066-1
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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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Was £164.99 - Save £9.99

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CCL Code: PSU1465
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Part Number: ACPP-P785FKC.11
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Manufacturer: Aero Cool
Kolink Core Series 300W 80+ PSU
  • 2x Molex Connectors
  • 4x SATA Connectors
  • 1x PCIe Connectors (6-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
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£22.99 inc VAT

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CCL Code: PSU1434
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Part Number: KL-C300
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Manufacturer: Kolink
ATNG ATM-400FB 400W PSU
  • 3x Molex Connectors
  • 3x SATA Connectors
  • 1x PCIe Connectors (6-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • Est. 3-5 Day Delivery
  • Order for Pickup in 2-4 Days
  • 1st Class Delivery - £2.99

£25.36 inc VAT

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CCL Code: PSU1505
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Part Number: ATM-400FB-1
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Manufacturer: ATNG
CiT ATV500 500W 80+ Bronze PSU
  • 3x Molex Connectors
  • 4x SATA Connectors
  • 1x PCIe Connectors (6-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • Sold out! Click Tell for stock updates

£25.95 inc VAT

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CCL Code: PSU0972
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Part Number: CIT ATV-500W RTL
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Manufacturer: CiT
Kolink KL-400 400W 80+ Bronze PSU
  • 2x Molex Connectors
  • 3x SATA Connectors
  • 1x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
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£30.95 inc VAT

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CCL Code: PSU0977
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Part Number: KL-400
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Manufacturer: Kolink