Overclocking Note 4 910C (KitKat) possible ?

Im going to buy within the next few days Note 4 910C (Exynos, EU ver) based on Android KitKat. Dont ask me why, but i wont upgrade it to any newer version as im interested exactly and only in 4.4.* version.
Are there any custom roms or ways to overclock GPU ? What is min and max clock speed of graphic proccessor in Exynos ?

from xda-developers http://ift.tt/2aXKIXP
via IFTTT