rx480 with mining bios on Windows 10 w/ last drivers
2g - 10 kh/s
auto - 11.1 kh/s
high - 11.3 kh/s

no memory issues with driver preventing memory usage or anything
running with:
setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100

ps.
previous version with workbatch 12 was showing 10.2 kh/s


pps. i have an issue with miner hangs when you scroll the text output in the window