i will start with two 580 rx
i want to know what is the best version
I am not quite sure what you mean with this, but if you're referring to types and brands Sapphire nitro+ is a decent one.
i reed that is memory type is so important it that right and it make different in hashrate
getting specific memory types is like a lottery, you ain't gotta know until it has been drawed. however it shouldn't be a hinder to get a decent GPU.
and i want trusted site to Calculate Ethereum profit i have a free electricity
Online calculators profit checking varied every moment, some pools has a profit estimates like Ethermine while you are mining with them.