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Why single rail is NOT better than multi rail - Page 3  

post #21 of 172
Quote:
Originally Posted by Phaedrus2129 View Post
They can be. I'm just driving home the point that, hey, on high-wattage units single rail isn't really a benefit.

And if a power supply has multi rail OCP that's properly configured then it should be pretty hard to blow it up.
Don't get me wrong, i completely agree with your post.

Just saying that we might end up with a situation similar to what we now have over in the AMD section, where no one will buy a 4+1 phase board because of some failures.
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post #22 of 172
Good post, Phaedrus. Perhaps this might change the minds of some members on here.... there was one thread like a week ago where one idiot asking for help completely refused to buy a "Multi rail" unit because he believed a "Single rail" was better... despite my attempts to sway him away from that mentality, he didn't listen. I just stopped replying.
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post #23 of 172
So does this still apply anymore?

http://www.overclock.net/power-suppl...explained.html

I dont feel as good anymore about my seasonic but yeah well, I'll see how it goes.
 
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post #24 of 172
Quote:
Originally Posted by thrasherht View Post
Not trying to argue the point, but how was it the fact that it was a single rail PSU result in it doing this? Could it have not just been the protection failed? Or do all PSU's with a single rail have this protection removed? I mean I have strong confidence that my single railed 650watt PSU is not going to have an issue. But you have to ask, was the PSU being a single rail souly to blame for this failure, or maybe a combined effort of different things that made this happen.


My other question is, why in the world did he need a 1600watt PSU. What was he running to need that much power? Wouldn't having a PSU that is too high of wattage also cause the PSU to be able to put out way more current then is needed to fry everything. I mean his PSU could have spiked into the 2000watt range before dying, while my PSU if put under that situation probably wouldn't manage to put out more then 1000watts before killing itself. So would having too much wattage also be helping the PSU kill itself worse?
From my understanding is that with just one rail you lose a lot of protection. There is a much larger window where power can be delivered before the OCP kicks in. If you fragment them in to smaller rails, you gain more control. An issue with this is overloading each individual rail with too much stuff, tripping the OCP despite plenty of headroom. This was fixed with numerous design improvements.
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post #25 of 172
Hmm.....Not sure what to think now. Are we certainly sure that this happened because of the single rail +12v ? Are we sure every single rail unit doesn't have a OCP on +12v ? I don't want my system to fry just like that. I mean, you know how to drive your point using all those horrifying pictures between your paragraphs and all...
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post #26 of 172
Thread Starter 
Quote:
Originally Posted by thrasherht View Post
Not trying to argue the point, but how was it the fact that it was a single rail PSU result in it doing this? Could it have not just been the protection failed? Or do all PSU's with a single rail have this protection removed? I mean I have strong confidence that my single railed 650watt PSU is not going to have an issue. But you have to ask, was the PSU being a single rail souly to blame for this failure, or maybe a combined effort of different things that made this happen.


My other question is, why in the world did he need a 1600watt PSU. What was he running to need that much power? Wouldn't having a PSU that is too high of wattage also cause the PSU to be able to put out way more current then is needed to fry everything. I mean his PSU could have spiked into the 2000watt range before dying, while my PSU if put under that situation probably wouldn't manage to put out more then 1000watts before killing itself. So would having too much wattage also be helping the PSU kill itself worse?
It's a confirmed fact that the Ultra X4 1600W has no +12V OCP. Even just looking at the internals, it doesn't have the massive shunt resistor a 120A+ OCP circuit would need.

And your TX650 is indeed vulnerable to this issue. It's a quality power supply; but it lacks +12V OCP. Many otherwise quality PSUs do.

And yes, his PSU was way overkill. But even if it had been an 850W the damage still would have been catastrophic. It just would have been a slower fire. A 60A short vs. a 100A short, 60A is still devastating.
post #27 of 172
Thread Starter 
Quote:
Originally Posted by nagle3092 View Post
So does this still apply anymore?

http://www.overclock.net/power-suppl...explained.html

I dont feel as good anymore about my seasonic but yeah well, I'll see how it goes.
This is just illustrating the point made in that guide, and coming down closer on the side of multi rail power supplies.
post #28 of 172
edit i has downs
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post #29 of 172
Quote:
Originally Posted by Phaedrus2129 View Post
This is just illustrating the point made in that guide, and coming down closer on the side of multi rail power supplies.
Yeah it took a re-read after posting, but the old guide definitely didn't make single rails look as bad. Do higher quality brands like Seasonic still fall subject to this (I would think they would but to what degree)?
 
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post #30 of 172
Well, just remind me next time to not use a crappy power supply, crappy motherboard(was not a "enthusiast overclocking motherboard"), and overclock my power hungry processor to way beyond the limits of my hardware.

Sorry, but how often is this really going to effect someone who doesn't do this sort of idiotic things with their rig?
     
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