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fornowagain said:You, the consumer cannot take the values for each rail, 12v1, 12v2 etc and simply sum them for a value. The manufacturer will normally in one way or another specify a value for the combined 12V source. Usually written as the maximum combined 12v wattage or the 12v1,12v2 cannot exceed.....
true, for example, both the Etasis 750W and 850W are rated at 18A max on each independent 12V rail (of which there are 4), but the load on the 4 COMBINED canot be more than 60A for the 750W version and 70W for the 850W version...... where the sum of the independent rail max voltages is 4*18=72A.
Thus the power supply can distribute its output over the rails in any way it likes, as long as both the rail max, and the total max are not exceded.