Which single PSU is best for 6x RX 570 and dual mining

[nu1mlock]

Hello everyone!

I'm building a dedicated mining rig and am wondering which PSU would be best for six RX 570 when dual mining? I was thinking a Corsair HX1200 but that might be pushing it? If not, what would you recommend instead?

I'd also take this opportunity to ask if there's any big difference in mining speed between the Sapphire RX 570 Pulse, Gigabyte RX 570 Gaming and the Sapphire RX 570 Pulse Mini (one fan)?

Thanks!

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[Vaccinus]

any 1200 or the evga 1300 will be good, but if you undervolt, i think you can do good with any good 1000 watt platinum not gold, and i don't think there is any big speed, usually the difference between different brand is very low like 10watt of more power, and better cooling for some brand