I have tried 3xxx, 5xxx and 6xxx cards without DXVA success but I have never tried a 7xxx card. I have a GA-X58A UD3R mobo and have had it running 5 graphics cards at once without issue, 1 was in an x1 slot. With this number of cards though I ran out of USB controllers to pass through even with the USB3, I never tried USB passthrough only PCI passthrough of the physical USB controller. This was with Version 5.0.
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