Click on Performance then just under it Tuning.
On the right side Enable Fan Tuning
Disable Zero RPM
Enable Advanced Control
Under the Fan Speed chart click the Fine Tuning Controls bar
> There you can adjust the Speed/Temp manually. (make sure you click Apply at the top)
These controls can be done on a game basis or globally. Best to keep ZeroRPM on globally, saves the fans.
When you click on the Gaming tab, click on the game your optimising then at the top you'll see the option 'Tune Game Performance'
When you've set it up for one game, look top right and Export Profile. This saves it, or it will revert to global.
It's a good idea to know how hot you GPU gets then sit and fine tune it under game load. I can have my fans around 38-45% instead of the stoopid 76% in ZeroRPM mode. Makes a huge difference.
Hope this helps.