Power supply question.

Ok so a person I know is upgrading his computer and I wanted to know for the future and now if you can add up all the 12V rails to get your total amperage.

For example.


With that power supply do I just add all the 12V rails up to get 72A? or is it different?

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  1. BUMP, need an answer fast if possible.
  2. You wouldnt get the full potential, mabye 65a worth
  3. Ok, I am trying to explain this to some body.

    Can some one thoroughly tell me why a single rail power supply with 72A is better then a split rail power supply that adds up to 72A?

    A single rail gives out much more raw power right? and it's more stable? or am I wrong?
  4. To a point IMO single railing is better, higher wattage such as 1000w+, i'd still give it to split railing

    alot of the newer companies such as pc power&cooling are single rail companies. you want a gaming psu, get a nice single rail. Usually if your going to get a split rail, you get something with more wattage so your sure all your railings are at high amps.

    I had an 800w kingwin running 4 rails, 22a 20a 22a 25a i think, or maybe 20a 20a 20a 25a.

    not every rail will be at full potential. They will have there own limited peaks for each main component in your system.

    But, i ran that psu on dual 3870's, yea you might think of it as an overkill but, it wasn't. had a high wattage but, that was just for how long it would last. i've had it for 3 years now, running a gtx 285 on it. No problems what so ever. Thats because you have to use 2 rails into a single gfx card. that leaves 2 rails left for the rest of the computer.

    All in all, single railage is the newest thing but, keeping things limited so you dont get an over amperage is much safer, even though they say theres some kind of special thing to keep your psu from overloading single railage, it's still possible for it to happen.

    This isnt putting on another war against multi rails vs. single rails, there both good psu's to a point.

    Single rails just seems to be more new and is getting better.
  5. For multi-rail psu's you can't just add the 12V+ rails to get the total amps. Usually the psu manufacturer will specify the total 12V+ watts available for all rails. To find the amps, divide the watts by 12. But for single-rail psu's, the amps for the rail is the total 12V+ amps available.
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