Try this (it's a bit aggressive, so you may need to add 5-10mV to each setting to attain stability.
1st stage:590Core clock,835mV
2nd stage:950Core clock,880mV
3rd stage:1040Core clock,895mV
4th stage:1105Core clock,910mV
5th stage:1170Core clock,930mV
6th stage:1230Core clock,955mV
7th stage:1300Core clock,1030mV
Set memory voltage to 930mV.
An important thing to understand before you start is what the Memory Voltage does. Look at the GPU core Frequency/Voltage table you've just exposed. As the GPU core frequency decreases, it needs less voltage to keep it stable. Simple. However, unlike the GPU core that can change it's frequency, the VRAM always runs at a fixed speed under load (and a single lower speed when the card is idle). There is a necessary amount of voltage required to keep that VRAM stable also. The card always feeds the GPU core voltage to the VRAM also (you can see this if you look at the VRAM Voltage Out VOUT/VID and compare that to the GPU Core Voltage VDDC in HWMonitor or HWInfo64). The "Memory Voltage" setting acts as a lower limit for the GPU core voltage to prevent feeding too little voltage to the VRAM and causing it to become unstable/crash. The reason we need to test for a minimum Memory Voltage here is to make the most out of power saving features like FRTC or Chill. If your Memory Voltage is set to the same value as the State 7 core voltage, the card may drop to lower frequencies, but the voltage will never go down. The more core States you can "open up" with a Memory Voltage that's lower than they are, the more flexibility you and/or your card has to adjust the power/heat/noise it's producing.
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