EVGA 100-EV-EB01 - Manual (Page 17)

Now it is operating Level 3 Opt Booster. At any point of time you wish to stop this, just press C to cancel.
There is also a Custom Level:
Upon Entering you will see that you have the power to control the frequency to go up and for how long (in terms of
seconds) and to go down and for how long (in terms of seconds).
Press OK to change an item or the Up and Down to navigate around the setup.