Think best for you to go is rig with 4x 580 8gb or 6x 580 8gb sapphire nitro+
If you go on 4x 580 then power suply with good quality 850w or 1000w is enought.
But if you go on 6x 580 then 1200w is way to go.
brother rx580 is not available in the market even it is then the price is too damn high
cant i purschase rx570 ?
thanks