the index only uses the primary card.i'm pretty sure the index wont be working properly as someone with x1950's in crossfire is getting the same as a 4870 crossfire setup. there isnt really much point to this index i suppose other than working out problems, i.e. if you and a mate have the same hdd and he gets say 4.5 and you get 3.3 on the index then you use it like that.
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