SS DA750 quad rails or single rail actually?

[wedfighter]

been reading from this site
http://www.techaddicts.net/reviews/da750/da750.html

*Update: SilverStone tells me that the pontimeter on the left adjusts / fine tunes the +12v voltage to optimize overclocking and system stability. The on/off switch on the right splits the +12v rail from a single rail to quad +12v rails. Although this obviously voids the warranty, it gives overclockers and computer enthusiasts a chance to tweak this power supply.

is it quad or single rail actually??
it's also found on OP650

[SnooP]

Theres potentially 2 12V power sources since its dual transformer design, afaik usually they just parallel them up to ensure even loading (so single 12V power source). They could also be split into 4 rails with current limiters, though seems a bit pointless considering its a single 12V rail label. JonnyGURU might know for sure

[wedfighter]

yes, we'll wait Jon to explained this
thx FYI

[Jon Gerow]

SnooP is right. All "split rails" are is diverting a single, or in this case dual, +12V source and sending it to a PCB that splits and limits the over current protection.

So most of the time when you have a PSU with "two" to "five" +12V rails, there's actually only one or two.

[wedfighter]

okay thx for your explanation jon...
one question, so if they split the OCP to several rails, are they combined to one big power or splitted to those 4 rails?

[Jon Gerow]

They don't split the OCP.

They split the rail up into multiple rails and then OCP each rail.

[wedfighter]

ok i c
so it also means that one big amps (or two in this case) was splitted to 4 different rails..right?
so what the advantages by doing this??
why they don't leave it as one big single rail?
thx b4

[Jon Gerow]

Separate rails makes the PSU "safer" because a short won't pull more than 20A which could electricute someone or cause a fire.

Also, the direction of current, ripple, noise, etc. is limited to between the OCP circuit and the connectors, so noise is isolated between one rail and another.