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Why single rail is NOT better than multi rail - Page 5  

post #41 of 172
i trust my volterra enough that im pretty sure i will never see this problem first hand.
post #42 of 172
to put it simply a single rail psu with 100 amp 12v rail with the OCP set at 120 amps will shut down only when the 120 amp limit is reached where as a multi rail psu with OCP set at a much lower point will shut down once that point is reached so instead of you psu saying with one rail "oh look a short,na it aint too bad i only need to shut down at 120 amps so lets keep going and see what happens" where as your multi psu rail says "oh look a short oh crap its getting close to my OCP point,i better take care of this when it hits 35 amps"

so am i correct in my assumptions headscratch.gif
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post #43 of 172
Quote:
Originally Posted by Phaedrus2129;12443023 
Rail fusion is marketing speak to make single rail sound even MORE awesomeamazing than just saying "single rail" would.


I dont think so. If you look at the link the PSU has 6 12v rails. And it says this: RailFusion
Responds to increased loads by automatically combining the +12V rails, providing ample power for multi-GPU systems.

I bought this PSU I have not used it yet but there is a switch on the back of the PSU were you can select to combine the 12v rails or not.
post #44 of 172
I have a question for Phaedrus, why is that Silverstone/Enhance and Corsair with some units from Seasonic prodominantly single rail units.

Surely Seasonic and Enhance with their team of electrical engineers, R&D, and product managers understand electrical current protection better than most.

Is the short circuit occurence so minimal that advantages between multi and single rails protection negligble at best?
    
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post #45 of 172
Who would ever buy a single rail PSU?
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post #46 of 172
Great read must say..thumb.gif

Hope my three rail CM has a quality OCP..tongue.gif

I think it does have a trip point of ~25A per rail though..

CHEERS..
     
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post #47 of 172
Quote:
Originally Posted by MangoMan;12443438 
Who would ever buy a single rail PSU?

people that don't need 700+watts
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post #48 of 172
It could be that the Ultra X4 1600W is a badly designed PSU. Wolf reviewed the X4 1200W version, and it did pretty bad. If the 1600W had a similar design, that could explain the failure.
Quote:
Originally Posted by yati;12443411 
I have a question for Phaedrus, why is that Silverstone/Enhance and Corsair with some units from Seasonic prodominantly single rail units.

Surely Seasonic and Enhance with their team of electrical engineers, R&D, and product managers understand electrical current protection better than most.

Is the short circuit occurence so minimal that advantages between multi and single rails protection negligble at best?
The Silverstone ST1500 1500W PSU (by Enhance) has eight +12v rails. It still puzzles me why Corsair went with with only one +12v rail on the AX1200 (by Flextronics). The Ultra X4 1600W PSU (by Andyson) in the OP only has one +12v rail at 117A.

Maybe for lower wattage PSU, single rails are fine.
Edited by Riou - 2/19/11 at 1:37am
post #49 of 172
Quote:
Originally Posted by reflex99;12443450 
people that don't need 700+watts

I have a dual rail 650W PSU, more stable this way. I have my hard drive separate from my video cards and MoBo.
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post #50 of 172
Quote:
Originally Posted by MangoMan;12443470 
I have a dual rail 650W PSU, more stable this way. I have my hard drive separate from my video cards and MoBo.

did you read the op?

He explains pretty well how OCP can cover for 650w
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