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Xigmatek NRP-PC402 400W Review

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Environmental Factors:

The Xigmatek NRP-PC402 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-PC402 at 200W loading will require 235W of input power and hence waste 35W as heat. A typical 75% efficient power supply, it goes on to explain, will require 267W of input power for the same 200W output and waste 67W as heat. Furthermore, if you use the NRP-PC402 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. 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-PC402 400W at $70.00 = $0.18/Watt (July 2009)
(At the time of writing this review, I could not find a price for the Xigmatek NRP-PC402 in the USA, so the price given above is a conversion based on £41.00GBP and $90.80AUS).

I could only find this power supply available in Europe and Australia with no USA suppliers, but I'm sure this will change. Xigmatek are probably better known for its quality processor coolers that usually end up performing only marginally poorer than their much more expensive counterparts and this power supply follows in the same tradition. The performance of the Xigmatek NRP-PC402 was pretty good, but when the UK price tag of only £40.00 is taken into account, it's certainly well worth your consideration. It easily maintained the rails at the required voltage up to its rated 400W loading and the efficiency was excellent (although, following the OCC testing methodology, it just fell short of the 80 Plus Bronze mark). The ripple/noise levels are a little disappointing, but won't prove a problem when installed in a system with a good quality motherboard.

The Xigmatek NRP-PC402 power supply isn't going to appeal to the heavy gamer or overclocker, mainly due to the 400W rating, single 6-pin PCI-E connector, which severely limits the range of graphics card that can be used on this power supply, and the fact that some exhaust air is introduced back into the case. I am not a big fan of dual 4-pin molex to 6-pin PCI-E adapters used to supply power to a video card when 6-pin PCIe connections are not included as part of the cabling. Even with that said I have no doubt it could power a single 8000 or 9000 series graphics card in a basic gaming system without any problems.

I would have to class the Xigmatek NRP-PC402 400W power supply in the entry level class, but don't take that the wrong way as it certainly performed far in excess of any generic unit. As such, it may be better to look at this power supply as a computer enthusiast's entry level unit. All in all it's not a bad power supply, at a fair price, that would go nicely with a low end gaming or folding rig running a single 9600, an office/internet PC, or perhaps a Home Theatre/Media Centre PC. If you are in the market for a 400W power supply, then it's certainly worth your consideration. The DC voltage load regulation is excellent, efficiency still at basic 80 Plus levels, and noise/ripple, although a little higher than I would like to see, still not high enough to cause problems. I think the Xigmatek NRP-PC402 still deserves an award based on its price/performance ratio and for that reason I think an OCC Bronze award is well deserved.



  • Very good DC Load Regulation
  • High efficiency.
  • Active power factor correction.
  • Price.
  • Quiet.



  • Excessive noise/ripple on DC rails.
  • Single PCI-E 6-pin connector.
  • 80 Plus Bronze not quite met.
  • Incorrect feature listing on packaging of PCI-E (6/8 pin connector when it's 6-pin only)


OCC Bronze

  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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