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you need more ram, each gpu needs a certain amount of memory.
Not true you just need 4GB to run Windows 8.1. and you probably didn't instal the video driver per card correctly.
Running 5 cards with 4gb of ram in Win 8.1 without problems. Driver is set for all same card's by default, o need to do any extra install "per card". No extra tuning was needed, apart manual pimp of Cgminer.conf . Must be issue with MOBO - my didn't liked powered riser in PCI-E slot-0 . Was kicking of GPU and acting weirdo. Fixed by swapping to non powered riser. Gl with making it work, as it should be!
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