Here is installation of the Radeon ProRender plugin for Blender 2.79 result:
![pastedImage_1.png pastedImage_1.png](/t5/image/serverpage/image-id/27468iE7E99BE151F60F74/image-size/large?v=v2&px=999)
And here is a picture showing the Prorender Menus activated in Blender 2.79b:
![pastedImage_2.png pastedImage_2.png](/t5/image/serverpage/image-id/27469i64F7A0B4AAC8AE19/image-size/large?v=v2&px=999)
Before anyone get's too excited because they see the checkerbox for an R9 200 series GPU - it's an 280X (aka HD7970) (GCN 1.0) GPU shown ticked...
The GPU does show activity in Wattman (i.e. it seems to be working) if I use it in Radeon-ProRender along with the Fiji GPU's to render.
However here is the render result if I just run Radeon ProRender on the R9 280x.
![pastedImage_3.png pastedImage_3.png](/t5/image/serverpage/image-id/27470iDA0CC1F233A515CE/image-size/large?v=v2&px=999)
A veritable camoflaged polar bear in the snow.
It's broken or unsupported on R9 280x GPU.