It would seem that no matter what I do, my visiontek rx470 4gb cards are stuck at a core clock of 751, only when dual mining (dcr or sc).  I have 4 rigs and have swaps boards, riser cards, etc.   They will operate normally under windows, however when using simpleminer, they will only operate at about 2/3 the hash rate.   I have 21 GPU's, 7 of them being these visiontek cards.  The problem will occur on any of my boards, and the settings for overclock does not seem to change anything at all.  I paid for my months fee, but I will have to explore alternatives if no resolution can be found.  I've posted about this before, several pages back.  My only thought is that it could be a driver issue.  Any input is appreciated.  


They will mine just ETH normally with expected hasrate