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)
I have 2 rigs with 4 x R7-370 3Gb running Optiminer v1.7 mining ZEC, on smOS using the "R" image.
Motherboard Biostar Racing GT7, 4gb RAM.
Very soon, I will retiring these R7s and replacing them with 1080ti because the R7-370 although rock solid cool performer... its the lowest hashing card in the farm and occupying precious slots.