Re: vega 56 or vega 64 for generic alt coin mining?

Better to not mix brands on one machine, the stability suffers quite a bit.
Might want to consider waiting for non-reference VEGA designs to start showing up (in theory later this month per some "prelimanary" announcements but no solid announcements yet that I've seen) if you're worried about cooling.

Are non-reference going to be cheaper? Right now the cheapest Vega 56 I can get is around 450 euros (tax included).

Where in the world did you get that price??? Please share the wisdom on here Grin

There is no such price. I do not understand why now buy VEGA? These GPU cost the same as 2 RX 580 GPU, but in production they are smaller. I think it is more profitable to use the old GPU. No one knows what awaits us in the future and therefore has great importance to payback period of the towers.