If you have set 300mhz, replace 0706 by 790mv, on all m'y test 790mw IS lower value stable... Make 790mv and you see you low power and lower temp ! 
what is the relationship between frequency and voltage? Also how directly does it relate to the power consumption? I tried to find information about such things but the web has too many documents discussing other stuff but using these words so search engines are net helpful. Would be really grateful for some hints / pointers or explaination as I am obviously trying to find a sweetspot of low enegery consumption and less noise fan speed.