I want to make OVERCLOCK on the RPI2.
I am interested in better performance
Especially in graphics performance and display of movie
Do the following parameters good?
Depends on your power supply. Those look a little high.
By the way, initial_turbo just means that the cpu is in turbo mode for the first 60 seconds after boot, and gpu_mem just means how much of the memory is reserved for the GPU. Neither are really considered over-clocking options.
Any gpu memory you allocate above and beyond what is needed, is just memory that is taken away from the operating system for other uses. The default 256MB of gpu memory on a Pi 2 is more than enough.