I have tried gaming app, with silent, gaming, oc mode its still on 300mhz, do not know what to do...
Have a nice day
Uninstall any 3rd party oc apps (first reset to stock/delete any profiles).
If that fails, then supply INFORMATION REQUIRED WHEN POSTING A QUESTION for someone to offer further suggestions.
Since you have not responded to the suggestions provided, I am locking this thread.
If you are still experiencing this issue, feel free to open a new thread, following the guidelines here : INFORMATION REQUIRED WHEN POSTING A QUESTION
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