1.5v at 5 Ghz and .784v at 1.4 Ghz sounds like it's a normal power saving state. (You don't need or want 1.5 volts going to any chip that doesn't need it.)
Maintaining full speed and voltage while at idle, is like putting your car in park at a stop light and flooring the accelerator whilst listening to the motor bounce off the rev limiter...all while you sit and wait for the light to turn green.
However, if you really want full speed and power all the time, (and most likely a shortened CPU lifespan) you can just disable "cool n quiet" in the BIOS and disable all C states.
(Cool n Quiet is an AMD feature. 1.5 volts is high for an AMD chip and way high for a sandy/ivy bridge CPU.)
im sorry i forgot to mention its going to 0.784 during gaming and load