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If you can find that information published, I would sure like to see it.
Clearly by someone with no understanding of basic electronics theory. When you put two resistance values in parallel, total resistance drops. In a DC circuit, if you have 10Ω in parallel with 10Ω, the circuit resistance is 5Ω. And Ohm's Law states I = E/R (current = Voltage/resistance) which means if the voltage remains the same, and the resistance is cut in half, the current doubles! And when current increases, so does heat. And as noted in my sig, heat is the bane of all electronics.i have read of at least one case where they did by splicing more than 1 fan to a single header.
I have never burned out a motherboard header, but then keeping fan noise to a minimum (while keeping high temps at bay) is always an objective with all my builds.
