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Corsair HX520W Review

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Environmental Factors:

With excellent performance for efficiency and almost unity power factor, the Corsair HX520W will play a small part in cutting your energy bills. The Corsair HX520W complies with RoHS and WEEE regulations, which isn't really unusual these days, if it didn't you wouldn't find it for sale in the UK. Packaging on the HX520W could have been better from an environmental point of view, there are alternatives to foam and the packaging uses quite a lot to encase the power supply. The bag for the modular cables, although nice to have, is of a synthetic/plastic base and I have to ask, is it really necessary?

Price Per the Watt:

Power Supply Corsair HX520W at $114.99 = $0.22/Watt (September 2008).

The Corsair HX520W power supply surprised me. It made no excessive claims for efficiency yet proved to be excellent. The rails held solid at all load levels and the DC quality was excellent.

The cooling fan is bearly audible, even at 1343 RPM. The 120mm thermally controlled cooling fan kept the unit cool without having to ramp the speed up to excessive levels. I feel a combination of large cooling fan, well designed heatsink layout and high efficiency all contributed to keep the unit cool.

I would highly recommend the Corsair HX520W to anyone considering mid-range graphics cards in SLI or Crossfire but perhaps it's a little underpowered for the serious gamer/overclocker. The Corsair HX520W is Nvidia certified for up to, but not including, the 7800GTX and is listed on the Nvidia website in the "For all other SLI configurations" section. This will no doubt put the majority of gamers considering an SLI or Crossfire setup off this power supply but if you require one for an Internet, office and single graphics card PC then look no further, the Corsair HX520W would be a wise choice. I have no hesitation in giving the Corsair HX520W an OCC Gold Award, what else can I do?



  • Excellent DC voltage regulation
  • Excellent AC ripple/noise levels
  • Efficiency of up to 85%
  • Active PFC
  • Good selection of connectors
  • Quiet operation
  • Five year warranty
  • Nvidia SLI Certified



  • The construction of the modular cables may not suit everybody
  • Minor hiccup in the operation of the Active PFC at low loads on 240VAC
OCC Gold

  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specification & Features
  4. Testing: DC Voltage Load Regulation At 110VAC & 230VAC
  5. Testing: Efficiency, Power Factor & DC Quality
  6. Temperature, Noise Level & Fan Speed
  7. Conclusion
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