I recently upgraded my s3's firmware what is with the new voltage setting underneath the freq setting? I run mine at 250mhz and have been doing so for 3mos now without a issue. What can this new voltage setting do can it give me more speed? I rn the on Corsair HX1000 PSU's So i got watts to spare 
very few s3s and no s3+s had the ability to change the voltage electronically.
its highly doubtful that setting will do anything on your s3.. you can try tho. you need a way to measure it to see if it did work.