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Xigmatek PC402 400w questions

post #1 of 7
Thread Starter 
Saw this on newegg (http://www.newegg.com/Store/Category...Power-Supplies), seems like a decent deal with 20A on each 12v.

What's interesting about it is that it's identical to the 500w as far as specs (same amps on all rails), only difference is 500w has an extra pci-e connector. While looking at reviews I came across an entry level psu roundup on tom's where it could handle being overloaded to 674w before shutting down, while all other psu's could only reach just over 500w. http://www.tomshardware.com/reviews/...us,2746-9.html (link explains better than I do)
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post #2 of 7
The 400W model has a +12V capacity of 384W, and the 500W version has a +12V capacity of 444W. That's not bad, although I still wonder how good these PSUs are internally. Sure, their capacities looks good (they're certainly not peak-rated units!!), but how clean is their power delivery? How stable is it? What about ripple suppression?

I'm sorry that I didn't read the roundup article, but I can't right now. I'm short on time, except I still wanted to reply as fast as I could while still have a few minutes.
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post #3 of 7
Thread Starter 
If two psu's have the same specs on all rails then what separates them as far as max power output? The main focus was the tom's review, it's very brief and I linked to the page devoted to this psu. They're saying that maybe the 400/500w are the same psu internally since the 400w could handle up to 672w.
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post #4 of 7
The 20A on each rail is just an advertised amount that's supposed to correspond to an overcurrent protection trip point. As in, if all +12V draw on +12V connectors X, Y, and Z exceed 20A (actually they generally set it higher than advertised to give you some margin), then the unit should shut down.

As Tator TwoCables pointed out, the 400W model is advertised as 384W (32A) combined on +12V across both rails. The 500W model is advertised as 444W (37A).

Generally different-wattage models in the same series are built off of the same design. There are many exceptions though: Corsair HX series spans two different manufacturers and maybe four designs, depending on how you count it. To create a higher-wattage version, they may add an extra transistor in parallel here, increase a capacitor or inductor value there, get a higher-spec rectifier somewhere else, etc. This increases the amount of power the design can handle (well). But the circuit board and design used is often the same.

Sometimes the number of changes between different wattage versions is small and ends up not effecting the performance much. All individual components in PSUs tend to be spec'd above what's theoretically required of them. So it's not very surprising if a power supply could supply significantly above its rated wattage for a brief period.

Tomshardware tends not to do ripple/noise measurements, and often PSU output rails can go way way out of ripple/noise spec when overloaded. I suspect you really wouldn't want that PC402 powering anything at that high of a load. Actually, those HEC-built Xigmateks probably have fairly high ripple to begin with, particularly on the minor rails. That tends to be a trademark of HEC.
Edited by mikeaj - 7/18/11 at 8:46pm
post #5 of 7
Tomshardware don't have any proper PSU testing equipment, so I wouldn't go there for PSU reviews. That particular Xigmatek is a fairly mediocre HEC unit.

Quote:
Originally Posted by xeon22 View Post
If two psu's have the same specs on all rails then what separates them as far as max power output? The main focus was the tom's review, it's very brief and I linked to the page devoted to this psu. They're saying that maybe the 400/500w are the same psu internally since the 400w could handle up to 672w.
That's just peak wattage, it doesn't really mean anything.
Edited by GameBoy - 7/18/11 at 6:37pm
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post #6 of 7
This particular HEC platform has been reviewed by JonnyGuru & at Overclocker's Club; OCC had out of spec ripple in their results, but it's obvious their is line interference generating higher ripple then what is actually occuring in the PSU.

Still though, ripple suppression is border line in spec; same with voltage regulation. Better units for the price exist; like the Rosewill Green Series 430w, Corsair CX430v2, Enermax NAXN 80+ 400w, Antec NeoECO 400C, & the OCZ StealthXStream 400w are all better alternatives.
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post #7 of 7
Note: the PSUs in the Neo ECO line do not come with a power cable. That's partly why they use the name "ECO". So what you do is just use one that you may have laying around.

In other words, if you don't have some PSU's power cable just laying around, then don't get the ECO series from Antec (or their "Green" versions of the Earthwatts series).
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