Don't bother with the 390... Rx480 is better and the new Rx580 is basically a Overclocked RX480 it turns out.
Amd tend to re-badge cards with tweaks ect.. but when the 580 comes out the price will go down on the 480 .. then you can grab it! by the end of this week.
you have a m.2 on that mobo, so why not make use of its crazy speed!
3GBs Read / 1.5GBs Write
https://www.amazon.co.uk/Samsung-M-2.../dp/B01M211K53
Vs normaly Sata3 SSD's limit of 512mb/512mb.
Tom does really good reviews.