Mostly RX 580 8gb whatever brand will give you around 29-31mhs even 32 with the right setup (mod-it and tune-it).
What is the max ever made by a 580 8gb in dollars??
$2-$5 a day is possible, depends on your way to mining with it.
I saw it reaching like 8 usd in December.... don’t know if it can possible do that. Hope it can!!
It is all dependent on the price of coins. For the sake of calculating mining profits, always assume the worst. On average you're making around $1.50 a day as things stand with a 580 with Ethereum. Considering ROI for most cards like the 580 is still below a year. mining is still extremely profitable compared to other investments, though.