Voltage drop is virtually non-existent. The 3.3v line dropped 0.01v under load, while the +5v line dropped 0.05 volts. All of the +12v lines were very stable and the greatest drop was on the +12v4 line (PCIe) and that dropped 0.06v under load. That equates to less that .5% drop. That is incredibly stable. As far as noise goes, I can't hear this PSU over the other fans in the system at all.