You keep saying this. Can you provide some support for this statement please?
Why would anyone want a multirail psu anyway? one rail overloads....you're done.
with a single 12v rail, no single pci feed can overload the psu...nor hamper the hashrate from limiting the current flow due to overdraw....period!
Hope that helps..
*Some may forget, but I'm an energy researcher, and recently consultant to a large energy corporation in development of fuel gasification technologies, more specifically in the development of more efficient systems using resonant energies through the application of harnessing the bounce of signal between a HV coil, and a PWM, as well as the enhancement of combustion through the use of adding Direct Injection, plasma ignition, and Hydroxy gasses made through the harnessing of the coil HV signal bounce, and shunted to a 143 plate cell where it is produced, and then metered into the Gaseous injection system, mixed with the vapors from whatever your fuel is in the gassifier...
enough on that...
but I can't stress enough how the actual current reaching any electronic(especially digital)device is critical to it's performance.