Here's some info. I'll pass on.

The first firmware has the voltage set to 0725, this runs my C1 at about 760 watts DC (after the power supply, multiply by 1.09 to get the approx. power draw at the wall with my Gold power supply on 120v AC).  My C1 runs about at or above the 1,008 Gh/s minimum at this original default voltage, temp. reading is about 50.
The second firmware ups the voltage to 0760, this runs my CA at about 830+ watts DC (after the power supply, multiply by 1.09 to get the approx. power draw at the wall with my Gold power supply on 120v AC).  I believe this was done to guarantee a 1,005 Gh/s minimum.  So if your C1 is running OK with the first firmware, you might want to try the original voltage to see if your C1 runs OK at that voltage, you'll save on heat (over 5 degrees less) and power (over 70 watts).