please no more multi rail or single psu debate. we've had enough of it. everything is marketing bs. heres the facts:
a multi rail psu has its load divided over multiple wires "or rails" to prevent over loading the wires
theres no true multi rail psu. all psu's out there have only 1 transformer
you can bridge points on a multi rail psu and make it run as a single rail, you will hardly notice a difference other then maybe overloaded wires, etc.
generally multi rail psus tend to be cheaper because they use lower quality wires which are not built to carry the whole load of the psu as opposed to the single rail psu's
with multi rail psus, theres a great possibility most of the time that it will not take out the whole system because the dangerous voltage spike will probably not happen across all rails.
multi rail psus cannot reroute the voltage all onto a single rail because each is rail capped. this means that you cannot really run high amp requiring things (excluding grafix cards) such as tecs, compressors, etc. this is the only advantage of single rail psu's
most high wattage psu's are multi rail
i stopped reading this after the multi rail vs. single rail stuff started. go back a few pages and READ rather then go through this again.
edit: one more hting, just read a few lines from that link.
however Dual Rail PSU's that follow the specs can not power highend SLI systems.
COMPLETE BS. THERE ARE MANY DUAL RAIL PSU'S THAT HAPPEND TO BE CERTIFIED BY NVIDIA TO RUN SLI. i refuse to accept any more of that article since it still contains factual errors and does not provide valid info