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Power Supply Roundup: 650W-680W
Power Supply Roundup: 650W-680W
Date: February 21st, 2008
Topic: Cases/Cooling/PSUs
Manufacturer: Various
Author: Christoph Katzer
Buy the XIGMATEK NRP-MC651 650W 80 ATX12V
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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.

Comparison: Cable Length   Next Page

 
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23 Comments - Last by larson0699, 474 days ago
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5 rebranded Seasonics + 1 real deal ? by yyrkoon, 639 days ago
Heh, sorry couldn't resist, although I suspect the Antec was manufactured by Seasonic, couldn't say for sure on the others. Anyhow . . .

" Most users don't need even 650W, but it's more difficult to find good quality PSUs in the 300-500W range, "

Antec EarhWATTS 500, using it myself, works very good, and is manufactured by Seasonic(or so I have read). Its also selling for less than $50 at newegg last I checked. Seasonic also makes a nice 500W'rs I think.

You guys said something about Seasonic pioneering the no frills look, and efficiency etc, and they started building PSUs in 2002 ? No idea, but I've read that PC Power and Cooling has been around since the 80's, and these have been their 'trademarks'. Assuming what I am saying here is accurate, I find it funny that you would mention these things about Seasonic as though they were the original OEM to have this philosophy.

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RE: 5 rebranded Seasonics + 1 real deal ? by Christoph Katzer, 639 days ago
Since then in the retail business with their own name.

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RE: 5 rebranded Seasonics + 1 real deal ? by HOOfan 1, 638 days ago
PC Power and Cooling is not an OEM...their PSUs are made by other companies...one of them being Seasonic and yes the Antec NeoPower is made by Seasonic.

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RE: 5 rebranded Seasonics + 1 real deal ? by HOOfan 1, 638 days ago
also the only two Seasonic units in that group are teh Seasonic and the Antec the Thermaltake, Xigmatek and Hiper are all CWT..they even state that in the article if you read it.

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Wake me.. by Griswold, 638 days ago
... when we arrived at the more reasonable 400-550W range.

Dont get me wrong, Christoph is doing a great job with these reviews but most if not all of them are for PSUs that are a wee bit too oversized for many people - even here at AT.

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RE: Wake me.. by jonnyGURU, 638 days ago
The problem is this community is very much divided when it comes to power consumption. Many people - even here at AT, may not be using SLI. The most decisive factor in power needs is what GPU you're using and how many of them you have. Given the current selection of SLI or Crossfire capable graphics cards on the market today, I would NEVER suggest anyone use a 400-550W power supply for any of them. Yes, you can run a pair of 8800 GT's off of a 500W for some time, but nobody thinks about the long term effects of running a PSU at 75%+ capability for extended periods of time inside a 40°C typical operating temperature.

Of course, SLI and Crossfire is not the majority of the populus. Dual processor even less so, so you are correct in the statement that most PSU's are "oversized" for many people.

But that brings me back to the point Christoph made; "Most users don't need even 650W, but it's more difficult to find good quality PSUs in the 300-500W range." This is TRUE. Yes, the Antec EarthWatts 500W is "adequate," but you're fooling yourself if you think it's near the quality of a CWT built Corsair, Thermaltake or Xigmatek. It's not cost effective to make these higher wattage, higher quality units in lower wattages and then price them to be competitive with "it'll do" units like the low end Seasonics. Again, is the Seasonic adequate power? Yes. If not stressed over long periods will they last seemingly forever? Probably. But the better quality units are in fact in the higher wattage range.

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RE: Wake me.. by yyrkoon, 638 days ago
Hi Jonny, Just going by what Christopher said, it would sound like a lot of systems could(possibly) not even come close to stressing a 500W PSU. I myself even bought a video card thinking of this(nv 7600GT). SO with an E6550 overclocked to 2.8Ghz, 2GB of DDR @ 2.0v, a CD/DVD burner, 7600GT , with 5HDDs how much power could I even be using ? Under a full load I doubt it would be much more than 300W, even if I had all my drives hammered at once(which never happens). Not only that, I use a reverse ATX case where the PSU sits on the bottom of the case, and draws air in from the bottom. Am I the norm ? Probably not, but I am sure there are many others who take all these things into consideration before building a system.

Sure, hardcore enthusiasts who *must* have dual - quad GPUs will need lots of power, but I think if someone were to take an *accurate* poll, these users could not possibly make up for more than %5 of total computer users out there(and it is probably much lower than that).

Now, if you are THE Jonny Guru, I must say keep up the good work, I based my PSU buying decision partially on your review of the EarthWATTS 500. It has not let me down yet, and going from past experience, I doubt it will any time in the near future(for the next couple of years anyhow).

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RE: Wake me.. by jonnyGURU, 637 days ago
Again, I never said that SLI or even a single high end graphics card is "the norm." No offense, but you only have a 7600GT. Not a high end graphics card and certainly not something that requires more than a 500W PSU. Heck... a 400W PSU. But that's what either Chris or I are saying: If you want a really good quality PSU, you can't usually find them in the lower wattage. It's simply not cost effective to spend $100 on the BOM to build a top notch PSU only to have to compete with other "it'll do" PSU's that sell for under $100!

I didn't necessarily say that anyone NEEDS these high quality PSU's, regardless of wattage, but do people really NEED to drive Jaguars, Lexus or Infiniti? No. They don't. But if you WANT a high quality PSU, regardless of what you're powering with it, what's wrong with going out and getting a 650W, 800W or even 1000W to get that kind of quality? Who are we to tell people how to spend their money?

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RE: Wake me.. by yyrkoon, 637 days ago
Can not say I agree with your Car<->PSU analogy. A luxury car is not necessarily better, and in the case of Jaguar, there are several 'lesser' manufacturers who make twice the car, for half as much. I do understand what you meant, and mean by quality PSUs.

Oh, and 'no offense' taken on the 7600GT, most people do not realize that if you're only playing on a 19" LCD @ 1440x900, that you do not NEED a freeking $500usd GFX card. It'll play just about any title fine, and most of the games I run are set at maximum settings. I also wont move to Vista, and Directx 10 anytime soon . . .

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Regulation testing by Super Nade, 638 days ago
Hi,

How are you arriving at your numbers for regulation? What kind of a load are you using as "idle" to compute the percentages? Is it the manufacturer supplied minimum values or is it something you have chosen at your discretion? I hope you are not calculating stuff based on 12.00, 5.00 and 3.30 values!

Also, why did you guys drop the rail-wise load distribution charts and the cross-loading tests? That was quite informative and nice to compare units at a glance. These percentages do not convey as much information.

Another suggestion I have would be to use standard, yet very simple statistical calculations (mean, standard deviation, variance) instead of these percentages.

Best wishes,

Super Nade @ OCFoums

Reply
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