Will it be feasible to fit 6 rx 580s 8gb on a 1000w gold psu with dual mining(dcr) ? I think the new rebrand uses more power than 400 series, or with tweaks is it comparable ?
It uses more power stock because of higher clocks, if u mod/undervolt, the power is almost the same as 400 series.
For dual mining i wouldn't even use a 1200w psu, let alone a 1000w one.
Dual mining with 580's will get you close to 1000w, way over the safe, 80% PSU usage.