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Xigmatek NRP-PC502 500W Power Supply Review



Environmental Factors:

The Xigmatek NRP-PC502 goes out of its way to push its green credentials. Its relatively plain packaging using recycled materials and the high efficiency of the unit itself go some way to saving the planet, and the manufacturer explains why on the underside of the box. The NRP-PC502 at 250W loading will require 294W of input power and hence waste 44W as heat. A typical 75% efficient power supply, it goes on to explain, will require 333W of input power for the same 250W output and waste 83W as heat. Furthermore, if you use the NRP-PC502 instead of a typical 75% efficient power supply for two hours per day, you will save 23360W in a year, reduce 14.6kg C02 release, and save 1.26 forty year old trees. The same claim is made for the 400W and 500W versions. Many other high end power supplies could make the same claims, but at least Xigmatek are trying to bring it to our attention, which is commendable. However, environmentally unfriendly foam inserts to protect the power supply are used once again; why has nobody come up with a viable green alternative? And is the drawstring bag really necessary?


Price Per Watt:

Power Supply: Xigmatek NRP-PC502 500W at $85.00 = $0.17/Watt (July 2009)
(At the time of writing this review, I could not find a price for the Xigmatek NRP-PC502 in the USA, so the price given above is a conversion based on £49.00GBP and $113.00AUS).

I could only find this power supply available in Europe and Australia with no USA suppliers. The performance of the Xigmatek NRP-PC502 was average, it easily maintained the rails at the required voltage up to 471W loading and the efficiency was excellent (although, following the OCC testing methodology, it fell short of the 80 Plus Bronze mark). The ripple/noise levels are very disappointing and are at a level that is really unacceptable.

The Xigmatek NRP-PC502 power supply will probably be OK in an office/internet PC but not in a gaming or overclocking rig. There are far better 500W units available in this price bracket.

I am not going to say anymore about the Xigmatek NRP-PC502 500W but I can't help thinking, could it be identical to the NRP-PC402 400W version with a little too much asked of it?



  • Good DC Load Regulation
  • High efficiency
  • Active power factor correction
  • Quiet



  • Excessively high noise/ripple on all DC rails
  • 80 Plus Bronze not met


  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. Testing: Temperature, Noise Level & Fan Speed
  7. Conclusion
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