First know that GPU OC is risky always but its worth it
The target power consumption (%) put it in the max value
For a mild/safe OC dont increase core voltage cause thats the most risky option to tweak...
Put the gpu fans on around 40-50%
Run valley benchmark and check your score
Then increase memory clock by +100 and run valley until you see instability (artifacts bsod) and check if the score starts getting less as you increase memory clock
When you notice it decreasing your score decrease it by a bit
Then start increasing core clock by +5 every time. When you find instability either increase core voltage to increase the clock more or decrease your memory clock by a bit so you can increasae your core clock more. But if you...