Intel does not have enough time on the assembly line to perfectly set the voltage to exactly what a CPU needs to be stable. It has always been easier and cheaper for Intel to use some extra voltage so that they can guarantee long term stability. Under volting removes the excess voltage that a CPU really does not need to be stable. It is not going to hurt anything.
Your configuration shows the voltage at its default values. All you have done so far is slowed your CPU down and reduced its performance. Why? Intel says that any CPU temperature under 100°C is a "safe operating temperature". That is why Intel sets the thermal throttling temperature to this value. This will force your CPU to slow down so it will always be on the safe side...