From pm discussions 4 vega 56's can be had for about 1700-1800 usd put in with a ryzen 1700 and a proper mobo.
Build is about 2200. it will do 8000-8500 for cryptonight/monero under 700 watts. so roi is under a year.
how good is that? I am not sure. What I don't like is if xmr tanks the card does not have a lot of value.
The price is coming down to the MSRP, which means that Vega cards should hold their value better going forward. I was really hoping for an ebay bucks promo this week with those Newegg Sapphire 56's at $419, but didn't happen, not for me at least. They're selling quite a bit at that price - I'm a little worried they'll raise it before another promo comes in. Either way, I see it as a good buy right now - XMR is pretty undervalued imo, and would only really tank along with a more widespread alt crash. And it's showing promise with other algos - I think this card has a lot of potential once miner developers have had more time to work with it.