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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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Antec NeoECO Modular 450W Modular 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 Priority Delivery
  • In Stock to Pickup Now
  • Free Delivery

£50.22 inc VAT

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CCL Code: PSU1423
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Part Number: 0-761345-10572-9
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Manufacturer: Antec
Game Max RGB 550W Modular 80+ Gold PSU
  • 3x Molex Connectors
  • 6x SATA Connectors
  • 1x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for Priority Delivery
  • In Stock to Pickup Now
  • Free Delivery

£59.99 inc VAT

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CCL Code: PSU1495
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Part Number: RGB-550
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Manufacturer: Game Max
Game Max GM-1650 1650W 80+ Gold PSU
  • 5x Molex Connectors
  • 7x SATA Connectors
  • 16x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for Priority Delivery
  • In Stock to Pickup Now
  • Free Delivery

£126.11 inc VAT

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CCL Code: PSU1494
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Part Number: GM-1650
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Manufacturer: Game Max
Game Max GS300 300W 80+ Bronze PSU
  • 1x Molex Connectors
  • 3x SATA Connectors
  • 4 + 4-Pin CPU Power Connector
  • SFX Form Factor
  • In Stock for 2-3 Day Delivery
  • Order for Pickup in 1-2 Days
  • Shipping from £3.95

£32.00 inc VAT

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CCL Code: PSU1401
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Part Number: GS-300
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Manufacturer: Game Max
ATNG ATM-550FB 550W 80+ Bronze PSU
  • 3x Molex Connectors
  • 4x SATA Connectors
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • Est. 3-5 Day Delivery
  • Order for Pickup in 2-4 Days
  • Shipping from £3.95

£33.64 inc VAT

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CCL Code: PSU1506
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Part Number: ATM-550FB-B
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Manufacturer: ATNG
ATNG ATM-650FB 650W 80+ Bronze PSU
  • 3x Molex Connectors
  • 4x SATA Connectors
  • 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

£38.79 inc VAT

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CCL Code: PSU1507
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Part Number: ATM-650FB-B
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Manufacturer: ATNG
Kolink KL-600 600W 80+ Bronze PSU
  • 3x Molex Connectors
  • 4x SATA Connectors
  • 2x 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
  • Shipping from £3.95

£41.99 inc VAT

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CCL Code: PSU0979
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Part Number: KL-600
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Manufacturer: Kolink
Corsair VS Series VS550 550W 80+ PSU

Corsair VS Series VS550 550W 80+ PSU

Ultra-short depth - just 125mm!
  • 2x Molex Connectors
  • 7x SATA Connectors
  • 2x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for Priority Delivery
  • In Stock to Pickup Now
  • Shipping from £5.99

£42.86 inc VAT

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CCL Code: PSU1520
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Part Number: CP-9020171-UK
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Manufacturer: Corsair
Be Quiet! SFX POWER 2 300W 80+ Bronze PSU
  • 1x Molex Connectors
  • 4x SATA Connectors
  • 1x PCIe Connectors (6+2-Pin)
  • 4-Pin CPU Power Connector
  • SFX Form Factor
  • In Stock for Priority Delivery
  • Order for Pickup in 1-2 Days
  • Shipping from £3.95

£46.44 inc VAT

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CCL Code: PSU0938
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Part Number: BN226
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Manufacturer: Be Quiet!
Kolink KL-700 700W 80+ Bronze PSU
  • 3x Molex Connectors
  • 5x 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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  • Shipping from £3.95

£47.99 inc VAT

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CCL Code: PSU1322
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Part Number: KL-700
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Manufacturer: Kolink
Game Max GM600 600W Modular 80+ Bronze PSU
  • 3x Molex Connectors
  • 6x SATA Connectors
  • 2x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for Priority Delivery
  • In Stock to Pickup Now
  • Free Delivery

£52.95 inc VAT

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CCL Code: PSU1403
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Part Number: GM-600
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Manufacturer: Game Max
Be Quiet! SFX POWER 2 400W 80+ Bronze PSU
  • 1x Molex Connectors
  • 4x SATA Connectors
  • 1x PCIe Connectors (6+2-Pin)
  • 4-Pin CPU Power Connector
  • SFX Form Factor
  • In Stock for 2-3 Day Delivery
  • Order for Pickup in 1-2 Days
  • Free Delivery

£59.99 inc VAT

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CCL Code: PSU0739
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Part Number: BN227
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Manufacturer: Be Quiet!
Great Saving
Antec NeoECO Modular 650W Modular 80+ Bronze PSU
  • 3x Molex Connectors
  • 6x SATA Connectors
  • 2x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for Priority Delivery
  • Order for Pickup in 1-2 Days
  • Free Delivery

Was £90.34 - Save £28.68

Now only £61.66 inc VAT

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CCL Code: PSU1428
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Part Number: 0-761345-10574-3
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Manufacturer: Antec
Corsair CX550 550W 80+ Bronze PSU
  • 4x Molex Connectors
  • 5x SATA Connectors
  • 2x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for Priority Delivery
  • Order for Pickup in 1-2 Days
  • Free Delivery

£62.62 inc VAT

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CCL Code: PSU1414
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Part Number: CP-9020121-UK
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Manufacturer: Corsair
Xilence Performance X 650W 80+ Gold PSU
  • 3x Molex Connectors
  • 6x SATA Connectors
  • 2x 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

£62.63 inc VAT

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CCL Code: PSU1550
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Part Number: XP650R9
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Manufacturer: Xilence
Fractal Design Intergra M 550W Modular PSU
  • 2x Molex Connectors
  • 5x SATA Connectors
  • 2x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for Priority Delivery
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  • Free Delivery

£63.45 inc VAT

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CCL Code: PSU0871
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Part Number: FD-PSU-IN3B-550W-UK
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Manufacturer: Fractal Design
EVGA 700 BR 700W 80+ Bronze 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
  • Order for Pickup in 1-2 Days
  • Free Delivery

£64.99 inc VAT

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CCL Code: PSU1587
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Part Number: 100-BR-0700-K3
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Manufacturer: EVGA
Cougar VTX 750W 80+ Bronze PSU
  • 3x Molex Connectors
  • 8x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for Priority Delivery
  • In Stock to Pickup Now
  • Free Delivery

£65.18 inc VAT

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CCL Code: PSU1364
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Part Number: VTX750
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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
  • In Stock for 2-3 Day Delivery
  • Order for Pickup in 1-2 Days
  • Free Delivery

£72.95 inc VAT

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CCL Code: PSU1368
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Part Number: GX-S650
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Manufacturer: Cougar
Fractal Design Intergra M 750W Modular PSU
  • 2x Molex Connectors
  • 7x SATA Connectors
  • 4x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor
  • In Stock for Priority Delivery
  • Order for Pickup in 1-2 Days
  • Free Delivery

£83.83 inc VAT

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CCL Code: PSU0873
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Part Number: FD-PSU-IN3B-750W-UK
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Manufacturer: Fractal Design