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i personally prefer NVIDIA to AMD -- but the price point i know lol -- why not buy 2 cards slightly better and try with crossfire. like an additional 2gb of memory. But the card cache is what makes them superior to cpu mining.

If clear that I know but it is that I do not realize a nvida 1070 is very expensive and offers 26 Mh/ s and with the same money as 36 Mh/s

Yes thats what i mean by price point -- so double up on the AMDs its best bet.