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Usually none of them are and you have to measure it to find the true voltage being fed.
However, in your case, if you can't measure it in any case, which I advise you do, then I'd go with ASUS Probe. I've found it to be close to correct in many cases. In either case, BIOS set won't be the real voltage, it should be lower.
And how do you mesure it?
Using a Multimeter you have to measure the voltage point on the motherboard around the CPU socket.
As is being talked about here (for another motherboard - red pointed metallic point there)
