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Dual 12V = bad?

post #1 of 19
Thread Starter 
I don't know nearly as much about PSU's as I do about the rest of the hardware in my computer; basically if it runs my it-shay it's good enough for me. It has been brought to my attention that single 12V is much more preferred than dual 12V. What is the reason for this? How is dual 12V worse? Can dual 12V adversely affect my performance / stability? Thanks in advance for the input.
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post #2 of 19
Thats wrong, and an old opinion. Just make sure to split the load between the rails and not plug most things into one rail.
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post #3 of 19
Who'd you talk to...a guy at Circuit City or Best Buy...

sorry for the poke..I couldnt resist
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post #4 of 19
Thread Starter 
My brother actually O_o

Thanks for the clarification though, and for the tip about not plugging everything into one rail; I would have done that in the interest of less wire clutter.
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post #5 of 19
1 rail is sometimes prefered if you have something that needs ALOT of power like a TEC.

Dual is generally 'better' because it makes things more stable by separating the draw between the rail or somethings like that.

TBH, i dont think it makes that much difference. As long as its a good, reliable strong PSU, your OK.
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post #6 of 19
Dual 12V is not necessarily bad, I agree with the previous posters. It depends on the design of the PSU, and there are many excellent dual rail PSUs on the market. Here is a part of a FAQ I currently am working on:

However, do we really need multiple 12V rails?
The answer is simple: no, we do not. As stated above, there are high-end power supplies with one single 12V rail that are SLI certified. These single 12V rails are rated at >30A, and thus likely build with high-quality parts. This is also confirmed by Intel, who unofficially dropped the 240VA standard in spring 2005, actually re-instating single 12V rail power supply units as an accepted standard.

Also, some high-end power supplies boast a single rail, such as the SLI certified, including certification for 7800GTX and 7900GTX, Silverstone SST-ST56ZF 560W, which packs a hefty punch with 38A on a single 12V rail.

As I said before, there are many good dual rail PSUs with more than enough power. And example is the ENERMAX Liberty 500W: 12V1 = 22A, 12V2 = 22A, combined 12V = 32A (384W), or the Antec TRUEPOWERII 550W: 2V1 = 19A, 12V2 = 19A, combined 12V = 36A (432W),

From these examples, it also shows you need to look how much current is totally available on the 12V rails. You CANNOT add them up! The Enermax might have more current on each rail, but the Antec delivers more total current than the Enermax.

Hope this helps.
    
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post #7 of 19
Yeah i agree with Chozart.

Ive only ever used single rail PSU's in my rigs and have never experienced any power/stability issues so far
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post #8 of 19
Having dual rails is good when powering different things. I have my HDD's on one rail and my peripherals on another (i.e lights, WC pump, DVD drive)
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post #9 of 19
Thread Starter 
My rails are 16A and 18A... Think I might need to upgrade that if I want to run SLI 6800GT's down the road?
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post #10 of 19
What brand/type is your PSU? Check on www.slizone.com for SLI certification. If you want to do any OC, then I recommend a good, reputable brand PSU, around 550W at least, with total ~32A - 35A on the 12V rails. Read my previous post about how you can't add the Amps on the rails up. check the label on the PSU for the total Amps (or Watts, and divide by 12) for the 12V rails.
    
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