I am really puzzled by this: On SMOS and HiveOS my 8 gb R9 390 hawaii cards are recognized as 4 Gb and the old versions can't generate Dag. The new versions of Phoenix miner try to use daglim which doesn't work either. The same is with lolminer. BUT Claymore works with 30 Mh (moded voltage but not vram timings). May be this is related to the kernel of linux - I know that after Ubuntu 16.04 and kernel 4.10 hawaii is not always working well. My current kernels are - 5.021 amd opencl 18.20 or 19.20. I can't find these os with older kernels.