Confused: Single vs Dual Rail ATX 2.0

[Capt_Caveman]

I'm building the system in my sig and currently have a 20-pin Antec True Blue 480 which has 22A on the 12v rail. If I plan to overclock to 4ghz, is this psu sufficient?

If not, I've been looking at a number of psu's:
OCZ 520W Powerstream
Fortron 500W Bluestorm
Enermax 485W Noisetaker
Antec 480W NeoPower

Reading the Tom's Hardware article on ATX12V 2.0, it talks how about dual rail is a good thing but the majority of folks in the forums believe a single rail is better.

Any thoughts will be appreciated. Thanks

[dicecca112]

dual vs single rail depends on what you have. For duallies, a dual rail is bad. But for all the dual rail psus I have seen, they are normally the 12v rail, and the power on them is measly usually no more than 28As. You want the rail to be beefy, I perfer like 30A or more. Of the psus you listed I would say IMO they are rated from top to bottom, from best to worse. I would go with the OCZ if you are willing to spend the money.

[Electron Chaser]

Dual Rails is good since you can isolate which +12 V rail powers which components on your rig. The downside is that you have to monitor how much load your are pulling on each side since you do not want to overload either rail. With a single rail you don't have to worry about these issues. In addition some of these dual rail PSUs have such meager Amp ratings that you may run into problems balancing the loads on each rail.

[dicecca112]

well I just remembered, that dual rail is okay in the case when the two dual rails can share voltage between the two, meaning if Rail 1 has x amount of voltage left over, and rail 2 needs y voltage, it will be sent over there to compensate.