If you still have the voltage on auto, you should take it off of that and set it manually. It is safe to set the voltage as high as about 1.36, possibly 1.4 if you push it a bit. Keep an eye on temperatures as well. Push it as high as you can while staying under 72C or so full load and 1.36 volts.
the voltage is limited and it's max value is 1,263 so how i am going to set the voltage higher ???
p.s. sorry for my bad english