hello, i tried r-v1081 image with r7 370 cards. but i have a problem. from vga output monitor stops screening when desktop gui app starting. i tried from hdmi-d output, desktop gui started but after a few seconds (15-20sec) monitor stops screening again.
mobo ga-970dsp and working smooth with rx image on my other rig.
I don't think R7 series is supported.
Here is info from main page of the site under requirements.
Any Drive (HDD,SSD or Pendrive) that can be erased
GPU Radeon AMD R9 200/300 / RX400 / RX500
DHCP (auto ip assigning)