As the title says I have an r9 390 and 290x in crossfire but they don't work in DX12 applications such as Tomb Raider. I've read that this is because drivers for different card crossfire don't function in DX12. Has anyone found a workaround, or is there a known driver update coming soon?
Make sure your not proper full screen and it should work. It works for me and my r9 390 with my R9 290.