Trouble with hiveos and using 2 miners to mine raven and eth

Hello,

I`m trying to mine eth with teamredminer with my 8gb cards and ravencoin with NBminer in my 4gb cards. Team red works fine, but nbminer gives a json error then fatal code 6 {same with other kawpow miners but they just dont recognize the 4gb cards.} if i pull nbminer and tell Team red to find all the cards all the cards `work` but the 4gb cards but are trash for eth.

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does its just not play nice?