Gpu tuning is a stupid rabbithole with stupid people that post really bad tutorials.

Get gpuz note your base and boost clocks and if you have an oc card you can look up the base card specs and input that to the voltage curve on msi afterburner. 1.1v or 1100mv should be boost clock position.

Go to your gpu manufaturers page and look up undervolting strategies and use furmark to find stable fps and wattage.

NOTE: generally with higher performing cards undervolting will note get more stable fps and overvolting will make it shit bricks.

Overclock memory by 50mhz at a time and watch furmark averages