You simply CANNOT trust these motherboard monitors; their readings can be off by significant amounts. Consider spending $20 - $40 on a multimeter if it would give you peace of mind, or you are seriously interested in knowing your voltages -- that's what I did recently. As you may be aware, it is a simple procedure to test your power supply with a multimeter.
Last week I bought an OCZ Powerstream 520 and adjusted it based on the readings that Asus Probe gave me (this, of course, was before I knew how inaccurate this program can be). I was surprised at how low the factory set voltages on the PSU seemed to be after I first installed it. It is a fortunate thing that these power supplies have voltage indicator lights as well as adjustable pots, because while Asus Probe was informing me that I had adjusted my 3.3V rail to exactly 3.3 volts, the indicator light on the back of the PSU was showing red (which means that the voltage is more than 5% above the specified voltage). I experienced similar results with the other rails, as well. Shortly after that, I bought a multimeter and was shocked to learn just how poorly Asus Probe measures voltage. Here are the last measurements taken from my system:
12V Rail : Asus Probe = 11.589 : Multimeter = 12.22
5V Rail : Asus Probe = 4.972 : Multimeter = 5.16
3.3V Rail : Asus Probe = 3.168 : Multimeter = 3.31
Pathetic.
So, all this to say that your power supply is probably fine and you have nothing to worry about. However, if you want to be sure, you will have to invest in a MM.
Al
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