Woah 
Between v11.1 and v12.0 i'm getting a huge hash drop. With 11.1 i'm getting ~205H on my R9 290. When I just fired up the v12.0 i'm only getting ~69-~75H. Am I missing something? I just checked 11.1 again and it's fine so it is definitely something in 12.0 :S..hmm.
Between v11.1 and v12.0 i'm getting a huge hash drop. With 11.1 i'm getting ~205H on my R9 290. When I just fired up the v12.0 i'm only getting ~69-~75H. Am I missing something? I just checked 11.1 again and it's fine so it is definitely something in 12.0 :S..hmm.Well maybe you're missing some overclocking stuff here? Have you checked the start file and the driver configuration?
I guess something is wrong with your configuration of inner features of miner, such as undervolting using miner directly. Or maybe you're over-clocking too much which is hard to handle for the newer version because of its optimization.