You can enter mV values but they will be ignored. GPU core voltage is calculated at runtime in relative steps to its base voltage. What you will need is an offset either hardcoded into the bios using a hex editor ( complicated ) or a tool like Strixx or Watttool ( simple ) to load the core voltage offset at system startup.
I have just started using watttool to adjust voltages, in regards to the memory i should copy the timings from 1750 strap across to the 2000mhz strap and flash that?
That is right. That is what most people do. But for the ZCash mining, it is better to use the stock bios.
