Could be more than changing the memory chip only mate, why engage in such way if you have no idea about it in the first place? It's why I don't listen to people who gave me such idea to buy 8gb memory and insta on 4gb rx570 of mine, the memory are costly and the chances of making it work is very slim
As i stated, it was an experiment. that 580 was getting dust in my closet and the chips i received for free. the only cost was the soldering itself, and was not expensive. I want to make a kind of proof of concept.
From my research i found that in some cases, the board is the same for 4gb and 8 gb versions of 580, hence the testing moving forward.
I also think that the issue could be 50% related with the bios setup (timings and other parameters) and 50% with the hardware (board) itself.
Before the testing, i assumed that something could go wrong, but was a calculated risk. My focus now is to narrow the issue root-cause, and test proposed solution from guys that are having more experience than me on bios customization and hardware knowledge.