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Dual 12V = bad? - Page 2

post #11 of 19
Just a heads up its better to have it one solid 12V rail when running one g-card and better to have it split when running SLI or Crossfire.
post #12 of 19
Thread Starter 
Quote:
Originally Posted by Chozart
What brand/type is your PSU?... check the label on the PSU for the total Amps (or Watts, and divide by 12) for the 12V rails.
It's an Aspire 500W PSU, I know not a reputable brand, but it got excellent reviews, and has the most reviews for 500W 24-pin PSUs.

I don't have access to my PSU right now, but I can't find total amps in the product specs online, unless I need to add something together for it?
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post #13 of 19
How do you think I would go about finding out my total amperage on my x-finity 600w psu (12v1=18A, 12v2=20A, 420W total)? It is on slizone as sli-ready, but i am just curious about its total amps.

EDIT....I just answered my own question with simple calculations...total watts/volts=amps, so my 420w/12v=35A
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post #14 of 19
Most dual rail PSUs have a single rail that is basically separated and filtered separately...so it's one source, but 2 separate rails. I think dual rails was actaully taken out of the atx 2.0 spec, because it doesn't really help.

I dono though...
I have dual rails, and I love this PSU...but I dono if it's cause of dual rails. My rails are solid and NEVER change...so that is something I like.
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post #15 of 19
MB's benefit from multiple rails it comes down to how manufacturers apply the ATX12V guides see here. The challenge for the PSUs has been the development of the GPUs and their hungry power requirements. The PCIe 6-pin has not been clearly defined as to which +12V rail to be drawn from. As a result some of the older (read current) PSUs cannot support these new GPUs even though they are excellent units.

The new PSU releases are having to think hard as to where the GPUs are connected and the smarter units are spliting these across different +12V rails. However there are some work arounds by spreading the load across the rails. This may not be clearly visible but each rail should be identified by the the use of a different Yellow wire marking.

If you have two +12V rails then one will have a blue or black stripe down the Yellow (12V) wires to indicate this rail. Other rails should then be identified in a similar manner.

There is a growing awareness that money and natural resources could be saved by adopting higher efficiency power supplies. Check out the Ecos Consulting group who are pushing this and promoting power supplies with better than 80% efficiency.

Overall multiple +12V rails will provide you a more stable system, the MB manufacturers are also designing their MBs upon these PSU specifications, it is about load balancing and the timing of new product arrivals which may have high supply demands.
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post #16 of 19
When you have a dual rail power supply, how do you know if you are balancing the load between the rails? I would think it should be marked on the plugs... but it's not. How do I know?
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post #17 of 19
Read the post above ..

Quote:
The new PSU releases are having to think hard as to where the GPUs are connected and the smarter units are spliting these across different +12V rails. However there are some work arounds by spreading the load across the rails. This may not be clearly visible but each rail should be identified by the the use of a different Yellow wire marking.

If you have two +12V rails then one will have a blue or black stripe down the Yellow (12V) wires to indicate this rail. Other rails should then be identified in a similar manner.

Quote:
Originally Posted by Fishie36
When you have a dual rail power supply, how do you know if you are balancing the load between the rails? I would think it should be marked on the plugs... but it's not. How do I know?
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post #18 of 19
Usually there's 1 rail for the mobo and GPUs and the other for the rest of the stuff...or some variation of that.
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post #19 of 19
I took some pics of my psu wires. They are split out completely even, everything is times 2 and easy to tell the differences from rail to rail, but there is still no markings that tell which rail each one goes too. I guess the best thing to do is just to distribute them through out your system as best as possible.





As you can see they are easy to seperate which one goes to a different rail.

BTW, this is the Ultra X-Finity 600W.
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