Xigmatek NRP MC651

Xigmatek is a newer brand and is only sporadically available in the US at present. Xigmatek began a few years ago with very promising cooler designs and they have now jumped on the bandwagon of high-margin PSUs. We received our sample a while ago (before the unit began shipping), so we don't have any retail packaging. The unit design is final, however, and it looks quite nice. The housing is black as is the grille, and the fan is transparent. You can find the real manufacturer listed on the front of the unit, but Xigmatek took the liberty of using different colored cable sheathes and shrinking hoses.

In terms of power ratings, we have a table nearly identical to all the other units. There are four separate 12V rails with a total combined power of 624W. The 3.3V and 5.0V rails have a combined power of 180W - slightly higher than the other units, though not particularly meaningful.

Xigmatek also uses 6-pin connectors for their cable management and provides four PEG cable harnesses, two with one 6-pin PEG and two with one 6/8-pin PEG connector. The two 6/8-pin PEG connectors connect to the main harness through the little hole on the front of the casing. The red jacks are for the additional two 6-pin PEG connectors if you need them for an SLI/CrossFire setup. With up to four PEG connectors, Xigmatek definitely gives users the best choice for graphics cards in today's lineup.

Opening the unit clearly reveals that Channel Well is the ODM. We have seen so many CWT power supplies lately that it's getting a bit tiresome. However, Xigmatek made some minor changes so they at least give this power supply something of a personal touch. All shrinking hoses and heatsinks are orange/beige, and you get an attractive "No Rules Power" plaque on the side (that's the NRP in the name). The results will show in a moment that performance is similar to the Thermaltake, which is no surprise considering it has the same components such as the Hitachi main-cap. For the secondary side Xigmatek went for Nippon Chemi-Con caps, which are a better choice.

Thermaltake Toughpower QFan Comparison: Cable Length


View All Comments

  • larson0699 - Monday, August 04, 2008 - link

    You mentioned that the label on the Thermaltake unit doesn't state maximum combined load of the lower-volt rails.

    But look, it does. 180 Watts.
  • BRDiger - Tuesday, July 29, 2008 - link

    I kind a wondering because comparing the efficiency level of the Be Quiet! to the testing datasheet on the 80plus.org site it just reaches about 80% at 100% load unlike your results with nearly 84%. Comparing it to the Enermax Modu 82+ review here, it even exeeds its efficiency
    Just wondering and it´s not supposed to be an offence...
  • BRDiger - Tuesday, July 29, 2008 - link

    Well, after reading another review it seems that 80plus was actually wrong and the be quiet!s performance exeeds the enermax.. Reply
  • strikeback03 - Friday, February 22, 2008 - link

    Thermal and fluids was not my best subject in school, but don't fans usually lose air off the tips of the blades, not suck it in? That is my experience with the Zerotherm Nirvana, which seems to make the same claim of sucking air in with its open fan. Reply
  • mo3 - Friday, February 22, 2008 - link

    The new Enermax Modular 82+ & Pro 82+ can peak over 700Watts with out a problem; also they have the ATX12v V2.3 and reaching 88% efficiency.
    Modular 82+ has 2x 12 pin connection embedded for up and coming graphics cards and greater stability.

    Just to give the readers a better alternative! :)

    Check out more info at: www.enermax.co.uk
  • crimson117 - Friday, February 22, 2008 - link

    Okay... PSU review.. new 9600 GT review... I think anandtech is trying to tell me I need a new computer! Reply
  • NINaudio - Thursday, February 21, 2008 - link

    Hi, you mention that the be quiet! PSU is quiet but also runs warmer than the others. Where are the temperature charts that we've seen in previous PSU reviews? It would be good to see the temperatures that you sacrifice for a quieter PSU. Is it a degree, 5 degrees, ten degrees, more? Reply
  • tynopik - Thursday, February 21, 2008 - link

    1. include a real stress test like how the units handle rapidly changing input voltage

    say load them up to 80% capacity and then connect them to a variac and dip the voltage to ~90V 3 times in quick succession to simulate a brownout or poor electrical conditions and check that
    a) it doesn't blow up
    b) it maintains quality output while the input if fluctuating

    2. include cheapo units for comparision just for the reminder of what a poor quality unit is

    3. i really love your connector length charts, far more useful than the usual 'stetch a jumble of cables out and lay a ruler next to it' approach. i just wish you would do the same for the sata/peripheral connectors

    4. i'm really like the way you combined all the acoustic and efficiency charts together instead of having a bunch of individual charts
  • Christoph Katzer - Thursday, February 21, 2008 - link

    I just assembled a nice system do to those tests. Once it's up and running I will include it. Will also make a comparison of all cables from now on, thanks.

    The problem with cheap units is that they are mostly for a specific market. I would need to buy thise units myself since no company would ever send them over. Since I am not in the US I will only have the stuff from Europe which is not even available in the US. But let us see how we could change that in the future...
  • jtleon - Thursday, February 21, 2008 - link


    You state that at least 100W must be drawn before these units achieve high efficiency. Can you relate this requirement to most normal PC tasks - i.e. browsing the web (reading Anandtech reports of course), answering email, other office based activities (the majority of PC users on the planet), rather than those hardcore gamers that are gaming around the clock (and clearly are independently wealthy!).

    It would appear that these PSU's are not going to efficiently reduce the carbon footprint of the majority of PC users on this planet.

    Am I wrong?


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