Thanks all for helpful comments.
About to order this one and run PCIE that come with the PSU directly to the riser board. I think 8pin in the RX580 and a 6 pin into the riser board.
Any other PSU recommendations or this one looks good?
https://www.amazon.com/gp/aw/d/B015YEI7LK/Super agree with
nc50lcThat's more than enough for your setup (4 x RX580). You have power and connector spare when you decide to add more card to your rig. Remember, always use recommended configuration for safer. You can use all above advice for your reference.
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