Dual +12V?

[FLESHnBLOOD]

This question might have been answered before, if so, can someone please point me in the direction of the answer?

On a PSU with Dual +12V, how are you meant to know what is better.
For example - some PSU's have +12V1 = 18A, +12V2 = 15A.

Where as others have +12V1 = 16A, +12V2 = 18A.

How are you meant to know what is better. :confused:

Also, what is there advantage (if any) over say a PSU with a Single +12V = 34A

[gvblake22]

well, I think you basically just add the two power specs together to get a total output for the +12v rail. I also think that a PSU with dual +12v rails that add up to 30A will probably be more stable/reliable than say a PSU with a single +12v rail at 30A just because there is not going to be as much strain on a single "rail". I guess it would be like splitting up the workload for the PSU... Instead of one HUGE muscular guy digging a big hole (doing work) you have two medium guys digging at the same time; the same hole still gets dug, but the two guys are less "tired" the one big guy after it is all said and done.
But thats my best educated guess so someone might wanna back me up or correct me:)