overclock/underclock our MTK devices.No custom kernel or ROM is required but the problem is that the CPU can't be overclocked. Only the GPU and other components like RAM and internal memory.
- All you need to do is to install a MTK Engineering app from Google play store.
- After that go to /hardware testing/DE-sense/PLLs - you will get to a menu with some different PLLs
ARM PLL - is CPU ( but can't be overclocked ) MM PLL - is the GPU ( it's safe to OC )
I don't know about other PLLs , I don't think is safe to OC them and you will not get any boost in performance. There are the default PLLs values for my MT6582 device ( all clock speeds are in khz )