i know that u said no cool n quiet but why not use cool n quiet then set the maximum cpu speed to a low percent that will get u 800mhz at 1V-1.04V. but changing the voltage wont change the power consumption, most chips use the same power at 1V or 1.3V though they just adjust the voltage to match the clock speed to not degrade the chip.

in your case though i would recommend to get a kill a watt, then u could see that its futile to try and beat the system that companies spent billions of dollars to get the lowest power state that they could without degrading the chips.