This forum doesn't recognise some formatting/grammar when copy/pasting so instead of me having to go through the entire thing and correct everything you can CLICK THIS LINK for a guide I've written on how to modify your Polaris GPU, it covers basic aspects, walks you through how to use the software you need, goes in to great detail explaining GDDR5 memory timings, how to add voltage offset for an NCP81022 voltage controller, Hex editing, etc. Everything you wanted to know rolled up in to one place basically.