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Combining 12V rails to one 12V rail on PSUs - Page 2

post #11 of 21
Quote:
Originally Posted by Urufu_Shinjiro View Post
The whole thing with the "multiple rails" done with the op thing is a marketing gimmick at this point. It's really better for a high end system to have a single rail with high amps instead of several fake fails with amp limiters on each one. If one rail is drawing 4 amps and the other is drawing 20amps and the psu can handle say 36 amps then it will still trip the protection and crash on you even though you have a ton of amps left. Switch it off and all that will happen is you will remove this artificial amp limit and it will load balance better. Blame this crap on ATX2.2 and marketing douches.
Its not a gimmick, it is just a way to produce cheaper power supplies. You can use multiple cheaper capacitors with multiple rails than a single high quality capacitor.
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post #12 of 21
My Mushkin combines the rails only when needed. Havn't tripped it yet, but I assume when I go crossfire it might. Niffty little feature to revert back to a huge single rail from all the seperate ones.
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post #13 of 21
Quote:
Originally Posted by pauldovi View Post
Its not a gimmick, it is just a way to produce cheaper power supplies. You can use multiple cheaper capacitors with multiple rails than a single high quality capacitor.
It's also because of European regulations that state that the max current you can have on one rail is 30 amps (I think it is 30 at least....)

The splitting of the rails was to circumnavigate these rules.
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post #14 of 21
Hmm I might pop open a couple PSU's and have a look and try this. The only way I ever got a multi rail PSU is if I wanted a very cheap one, but I do have a couple dual 12v PSU laying around.

...and yeah, I've always heard the official reason for dual rail was to circumvent the max amps per rail rule. Though I've always been sure the generic PSU makers thought it meant that you could get by with cheaper capacitors and smaller heat sinks.
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post #15 of 21
thats dumb
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post #16 of 21
Quote:
Originally Posted by bdattilo View Post
It's also because of European regulations that state that the max current you can have on one rail is 30 amps (I think it is 30 at least....)

The splitting of the rails was to circumnavigate these rules.
its 20--
according to the IEC 60950 standard.
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post #17 of 21
Quote:
Originally Posted by superon View Post
its 20--
according to the IEC 60950 standard.
Poor guys can never have Silverstone DA's and PCP&C's...
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post #18 of 21
ok I have to ask what is this rule about with max amps per rail thing?
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post #19 of 21
Quote:
Originally Posted by rx7speed View Post
ok I have to ask what is this rule about with max amps per rail thing?
It's a specification designed for safety, because that's what the average 12v cable can draw.
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post #20 of 21
I already got a single rail
Very nice!
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Very nice!
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