What does your bat file look like? I just downloaded sgminer 5.5.5 and it's running at 279kh on an r9 390
setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 95
setx GPU_MAX_SINGLE_ALLOC_PERCENT 95
setx GPU_MAX_ALLOC_PERCENT 95
setx GPU_USE_SYNC_OBJECTS 1
sgminer --algorithm scrypt-n --nfactor 11 -o : --p x -I 14
pause
Shit sorry, I lied bro, it's 305, slight oC on afterburner, not sure which drivers. Not 15.12 as the produo they're paired with needed recent drivers.