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Single Rail vs. Multi Rail *Explained* - Page 7

post #61 of 158
Thanks man, now I know single rail PSU's overclock farther and cook me pancakes.
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post #62 of 158
I still don't fully understand the single rail vs multi rail argument.

Most of the article sounds like multi rail is way better because it offers better protection, but in the end it says it doesn't really matter.

What are the real chances of a single rail exploding vs a multi rail? Not something I should be concerned about? From these postings it seems like you are getting into the danger zone with 750+ watt PSU's on single rails but yeah, like I said I don't understand it.

I'm stuck choosing between an XFX 750w with a single rail or the Antec High Current Pro which has multiple rails but is $30 more.
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post #63 of 158
Thread Starter 
A single rail PSU won't blow up on its own or anything. But if the power circuitry on your motherboard or graphics card fails in one of a number of certain ways (not uncommon) the single rail PSU will keep supplying current until either it fails, or the card/motherboard catches on fire.

So in other words, if you plan to use anything from MSI or a reference GTX570, it's best to use a multi-rail PSU. wink.gif Otherwise it's not critical. The complaint against single rail PSUs is more that they're claiming the *lack* of an important protection as a feature.
post #64 of 158
Thanks Phaedrus for the quick response.

I just ordered an MSI graphics card to SLI so erp.. guess single rail is out.

I think the XFX was a better PSU but the Antec should be fine. JohnnyGuru likes it, HardOCP doesn't, and there's only 1 newegg review on the HCP-850.
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post #65 of 158
applaud.gifapplaud.gifapplaud.gif Bravo to you sir smile.gif Thank you for explaining that. Really loved how you did the explination.

PS I know this is an old thread but I just came across it smile.gif
post #66 of 158
Thread Starter 
Quote:
Originally Posted by mlp;15075259 
Thanks Phaedrus for the quick response.

I just ordered an MSI graphics card to SLI so erp.. guess single rail is out.

I think the XFX was a better PSU but the Antec should be fine. JohnnyGuru likes it, HardOCP doesn't, and there's only 1 newegg review on the HCP-850.

The MSI thing was more tongue-in-cheek, since their budget (and even some high-end) motherboards tend to have very weak voltage regulators that can blow up if you overclock the system too much. It's not a 100% thing though, just a bit more common than with other companies' products. And their graphics cards aren't any worse than usual when it comes to VRM failure.


Just poking fun at them was all. wink.gif

As for the XFX BE 750W vs. the Antec HCP-750, it's kind of a toss-up, really.
post #67 of 158
Quote:
Originally Posted by Phaedrus2129;15075602 
The MSI thing was more tongue-in-cheek, since their budget (and even some high-end) motherboards tend to have very weak voltage regulators that can blow up if you overclock the system too much. It's not a 100% thing though, just a bit more common than with other companies' products. And their graphics cards aren't any worse than usual when it comes to VRM failure.


Just poking fun at them was all. wink.gif

As for the XFX BE 750W vs. the Antec HCP-750, it's kind of a toss-up, really.

Ah, I gotcha now.

As for the actual cards I am in between the XFX Pro 750w XXX edition... can't find the BE anywhere.

http://us.ncix.com/products/?sku=62224&vpn=P1750BNLG9&manufacture=XFX

And the Antec HCP-850 because it is only $5 more than the 750 model. Then again, the XFX 850 is only $10 more than the 750 heh... I can see how this can start to be excessive.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817371053&Tpk=hcp%20850

Pretty sure I read somewhere that single rails start getting into trouble when they have 70amps on a single rail, that xfx i linked has 62a not sure on the 850w model. That is what has me scared!
Edited by mlp - 9/26/11 at 4:29pm
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post #68 of 158
This has been very useful since I am looking at power supplies as i am upgrading my system. Will now go back and re-look at all my considerations and see how they all stand.
Thanks again.
    
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post #69 of 158
Nice guide, can you make the "questions" on OP bold? it will be easier to read. smile.gif
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post #70 of 158
Hi, Excellent guides, helps a lot.

I have read quite a few of your threads, but either I missed it or it hasn't been brought up.

When I look at many multi-rail power supplies, the added amperage of both rails far exceeds it's actual possible output. Does one rail balance out the other rail ?

For example , This 750w Enermax Naxn (who went solytech all of a sudden!) has 2 x 35amp rails, but only a total output of 648w. So instead of 70a/840w like some people might think, it really only has a total 54a/648w.

Hardware Secret overloaded both rails to 30amps each before the fail safes shut down the power supply ...
http://www.hardwaresecrets.com/article/Enermax-NAXN-82+-750-W-Power-Supply-Review/1275/8

Same thing goes with the 650 Antec Earthwatts with 2 x 38amp rails, but only 650w max.

Do these rails do a balancing act like a teeter totter ? If 1 rail is pulling 34a/408w that means the 2nd rail will only have 648-408w = 20a/240w to work with ?

Or do both rails have the proper connectors to each rail on the Enermax and Antec that it would be almost impossible to trip them ?

Thank you.
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