Does anyone know what rx 580 card is best for mining? Should I get a 4gb or 8gb card? I'm getting 2-3 cards but will probably start off with 2 for now to test it out. I've noticed the sapphire nitro+ cards are really good rn but I found the asus strix 4gb models for about 40-50 usd cheaper, but if you guys know of any better cards please. I also don't pay for electricity