Computer Power Supplies

Shop by price

Computer Power Supplies

A vital part of a computer, computer power supplies provide the very power your computer needs to turn on and run all of the parts inside. An inadequate power supply can cause crashes or prevent the computer from even turning on. Choosing a power supply is important and the choice boils down to two factors.

Overall wattage

Your computers overall wattage is the amount of power required to run it. This can be calculated by hand yourself or via online calculators. It is always best to go over what you need in case you adjust other devices later that have a higher power requirement. It is always better to have too much power than too little, as your computer will limit the amount of power to what it needs. Extra power will not hurt your computer system or the CPU .

Rail specific power

This is how much power each individual component or device uses up from the power supply you have chosen. This isnt important in cheaper, less powerful computers, but in larger gaming computers that possess overclocking you should be careful about drawing too much. The instruction manual that comes with your graphics card and other accessories should contain this information. This is where aiming higher for the overall wattage comes in handy.

A power supply may have a 12V rail to draw power from or multiple rails, which are safer for your interior devices. 12V power supplies can easily protect them from there being too much power drawn from a single rail. Once again, this applies to only very high quality machines and for most computers does not make much of a difference.


Power supplies are rated for their efficiency, which basically looks at energy loss. The best ones are 80 Plus certified, whereas less high quality power supplies will waste more power.

Top Products in Computer Power Supplies

  • AeroCool Integrator 80 Plus 600w ATX PSU Power Supply 12cm Black Fan Active PFC
  • EVGA Supernova 650 G3 650W Fully Modular Power Supply Black (220 G3 0650 Y3)
  • Corsair HX Series Hx750 750 W 80 Plus Platinum Full Modular 1 X 135 Mm Fan ATX
  • Silence 500 Watt ATX PC Power Supply PSU with 12cm Silent Fan and SATA 24 Pin
  • AeroCool Integrator MX 700w Power Supply Semi Modular 80 Plus Silver 12cm for
  • Corsair Hx850 850 W Full Modular 80 Plus Platinum 135 Mm Fan ATX Power Supply
  • Corsair Series 450 W Cx450 Atx/eps 80 Plus Bronze Power Supply Unit Black
  • Corsair Hx1000i High Performance Series 1000 Watt 80 Plus Platinum ATX Powe
  • Corsair CX450M 450W Semi Modular Power Supply Unit Black (CP9020101UK)
  • Corsair TX 650M Series 650 Watt 80 Plus Gold Hybrid Modular Power Supply
  • Builder Series 500watt 500 Watt 500w ATX Power Supply PSU SATA Black UK
  • EVGA Supernova 750 G2 80 Gold 750w Fully Modular Eco Mode Includes POW
  • Corsair Professional Platinum Series Hx750i Atx/eps 750w Power Suply
  • Power Supply 1000 GQ 80 Gold 1000w Semi Modular EVGA Eco Mode 5 Year
  • Corsair Sf600 SFX 600 W Fully Modular 80 Plus Gold Power Supply PSU
  • EVGA Supernova 750 G1 Full Modular 80plus Gold 750w Power Supply
  • Corsair Tx550m 550w Modular Power Supply 80 Plus Gold
  • ACE 750 Watt BR PSU with 12cm Red Fan and PFC Black
  • ACE 750w BR PSU With 12cm Red Fan and PFC Black
  • Corsair Cx550 550w Power Supply 80 Plus Bronze

  • More to explore