I have a 1070 already in a vr ready pc and I could add a vega 56
would I run into issues?
If you have the necessary power and you can connect two cards to your system, yes.
Usually mixing AMD/Nvidia GPUs on one system is easier on Windows. It can be done on most Linux distributions, but installing drivers is generally much more of a pain.
yeah was going to use windows.
now if I go this route can I use them both to mine 1 coin and or split the coins the cards to mine 2 coins each?
will I run into problems where one card cant mine one coin?