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Simple question about rails - Page 2

post #11 of 23
Quote:
Originally Posted by smokinbonz View Post
buy a multiple rail psu you may find yourself in a predicament, lets say your vid card needs 18A and your rails supply 60 amps over 4 rails, guess what yoyu cant run that card cause no single rail is capable of delevering over 15 amps soo youre stuck.
If your video card needed 18A, it would need two PCIe plugs. However, don't forget the card would draw up to 6.25A from the PCIe slot itself. Therefore, the plugs would have to deliver 12.5A. Generally, if the PSU is certified for that much power, the motherboard power is usually seperate from the PCIe power.

Basically, don't worry too much about multi vs single rail. It rarely happens where one of the multirails gets overload in real world use.
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post #12 of 23
Thread Starter 
Ok, Thanks all. I'll probably either wait and see what new single or dual high current rail PSUs come out by the time I get any new hardware that might push my existing 600W too far or just get impatient and get the multi rail flagship enermax.
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post #13 of 23
Quote:
Originally Posted by ghell View Post
So single rail is no better or worse than multi rail? If this is the case, why are both sold but single rail becoming increasingly popular in very high end PSUs?
one simple word sums it up

marketing.



you make your product sound good people will buy it. you tell them single rails are best people buy single rails. you tell them multi rail is best they will then buy multi rail.
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post #14 of 23
The technology is at the point where the amps on each rail are matching large single rails. Not really a marketing gimmic, just a matter of providing both so every buyer is satisfied.

Only real disadvantage, at least with quality PSUs, for multi rails is you have to calculate a little to find the actual amperage.
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post #15 of 23
Single-rail versus multi-rail power supplies


Lines are being drawn in the power supply war. On one side, we have vendors such as Tagan pushing “multi-rail” designs on its big 1KW+ PSUs. On the other side we have PC Power and Cooling which is pushing a single-rail design 1 Kilo Watt model.

If you think of each of these rails as its own power plant, a multi- or split-rail design breaks up the power among multiple power plants. So, on Tagan’s TurboJet TG1100-U95, you get four power plants, each capable of producing 20 amps of 12 volt power or 240 watts per rail for a total of 960 watts. PC Power and Cooling single-rail Turbo-Cool 1KW-SR features 72 amps of 12 volt or 864 watts continuous and can peak at 960 watts all one single rail.

Which design philosophy is better? I won’t draw any conclusions here but I can give you each side’s spin on the issue.

First up is Tagan, which argues that it’s about death and following the rules. A multi-rail design, the company says, is much safer and some international safety organizations don’t allow you to output more than 20 amps per rail. More than that, the company tells me, it could possibly kill you.

Tagan also says a multi-rail design complies with the EPS12V spec which everyone agrees to follow. If hardware vendors follow the EPS12V specifications for power requirements, they shouldn’t violate an EPS12V PSU.

As the sole PSU vendor pushing a single rail design for big PSU’s, PC Power and Cooling’s argument is quite intriguing. Even though the company once also pushed a multi/split rail design, the company has since decided that the single rail is the future.

The problem with multi-rails, the company says, is that power tends to get stuck on the individual rails. If the PSU, for example, allocates 36 amps of power from rail 1 and 2 to the CPU but the processors only consume 22 amps – the rest cannot be reallocated to the GPU or hard drive array. With a single-rail design, if the CPUs only use 22 amps of juice, the rest can be sent to the GPUs or whatever else needs the 12 volt power because it all comes from a single bucket of power.

As for spec’s, PC Power said the spec’s were written in the days when CPU power consumption was a runaway freight train. With Intel and AMD pushing low power chips, locking up X amount of amps for CPUs that will get used is the wrong way to do it. As far as safety goes, PC Power says it has certifications from UL and other international test labs that say it’s kosher.

The practical upshot, if both have done their homework on their PSU designs, is both will work. I think the single-rail certainly sounds more efficient with its send power where it’s needed outlook. But multi-rail designs should and have worked as well up to this point.

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post #16 of 23
Thread Starter 
Thanks a lot for linking me to that article. That cleared up a lot of things.

I'm pretty sure that 20A can kill you anyway. I'll have to ask my brother (he has made a taser from base components and he's a medical student so he knows a lot of things about electricity and the human body - fribulation etc)
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post #17 of 23
Quote:
Originally Posted by ghell View Post
Thanks a lot for linking me to that article. That cleared up a lot of things.

I'm pretty sure that 20A can kill you anyway. I'll have to ask my brother (he has made a taser from base components and he's a medical student so he knows a lot of things about electricity and the human body - fribulation etc)
Not at 12V.
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post #18 of 23
The only reason they ever changed to multiple rails was that the standards changed a while back to limit the amps per rail to 18 Amps. Most of the time, they took one big rail and pulled the "smaller rails" power from it, with 18 Amp fuses. To sum it up, it doesn't matter, just if you purchase a multi-rail psu you need to balance your load (aka don't put everything on the same rail), and if you get a single rail, do not mess with it when it is turned on(probably a good idea even for a multi rail.)

Oh, and 20A at 12V can kill you easily. I am a Junior in EE and happen to know of a man who (no joke) got killed with electricity from a 9V battery. I would explain how, but there are too many young impressionable minds on here.
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post #19 of 23
Quote:
Originally Posted by AARDVARCUS View Post
Oh, and 20A at 12V can kill you easily. I am a Junior in EE and happen to know of a man who (no joke) got killed with electricity from a 9V battery. I would explain how, but there are too many young impressionable minds on here.
Sorry... for clearification, your skin provides enough resistence (1MΩ) to prevent 20A@12V from kill you. However, you can still kill yourself other ways bypassing the skin.
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post #20 of 23
Quote:
Originally Posted by ghell View Post
Thanks a lot for linking me to that article. That cleared up a lot of things.

I'm pretty sure that 20A can kill you anyway. I'll have to ask my brother (he has made a taser from base components and he's a medical student so he knows a lot of things about electricity and the human body - fribulation etc)
Glad I could help.
    
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