I don't have modded BIOS's or anything like that, but with a bit of an overclock, I've seen more like 22 MH/s. I guess if Vega 56 could do 45 MH/s for $400, that would be great, but...
But hey, if there's a way to get 30 MH/s right now today, damn, let me know. o_o
Why would you mine at 22 MH/s on Polaris cards, pretty much everyone mods their cards to run 27-28+, even most calculators like whattomine have been showing ~ 30 MH/s for 480/580 cards for months. That's just the standard thing to do, if you don't mod the card then it's wasted, you might as well just go with nvidia then since they offer similar ~ 22 MH/s at lower price and lower power consumption. A gazillion guides on how to tune your Polaris card out there, like this one, for example:
https://bitcointalk.org/index.php?topic=1954245.0I ordered 3x VEGA 64 just to add to my mining capacity on Intense Coin (Cryptonight) and also for fun since I don't own any VEGAs yet & I landed them for $549 each (I'd rather pay under 500... but it was acceptable).
I was considering buying a couple of Vega's as well, but I made myself a promise to not buy reference one-fan cards years ago.
Had ati radeon 5870s mining bitcoins that were super loud and said to myself "no way I'm buying anything like this again!". But then amd released 6950 cards, and many reference ones could be unlocked to 6970s (while most non-reference ones couldn't), so I broke the promise and bought some reference 6950s.. which sounded like vacuum cleaners, of course. After that I figured enough is enough and I'm done with this crap, but couldn't resist to play the lottery with 290 unlocking to 290x. Except none of my reference 290s unlocked, so I just ended up with a few super loud and hot refs that I hated. And that was the last draw, since then there's absolutely no freaking way I'm buying a reference AMD card again.