There was a craze a few years ago for single-rail 12v PSU's. the argument was having a single beefier rail will allow you to more intelligently use the 12v power you need, without having to worry about balancing between rails, or overloading one rail, etc. Many high end PSU's still offer single-rail PSU designs because of this. My PSU is also a single-rail design.
*Edit: For what it's worth, a single 12v rail PSU actually does not meet the newer ATX specs, which require multiple 12v rails as part of the spec.





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