January 8, 201610 yr For what it's worth, I resolved this by getting a motherboard that could fit several GPUs. Intel's X79 and X99 platforms do not support integrated graphics, so I could not pass through the primary GPU, but I could pass through several others without issue. Nvidia Control Panel detects all the passthrough GPUs, but does not see SLI capability. This setup would be helpful for productivity, but not for gaming. Of note, I'm still under the impression that there must always be a host VGA device. I've found no workaround for this, so in the future I'll have an R5 220 for host and a high-end single GPU for my gaming VM. I have found that it is somehow related to the GPU used. I have a Gigabyte DS3P with two x16 slots (The second only x4 mode). I have two GPUs, one Gainward GTX 760 and one Sapphire HD6450. I can not get the Nvidia card to work if it's in the first slot, but in the second it works if there is a card in the first slot. If there is no card in the first slot, it doesn't work. The AMD card works in both slots no matter what. But when 6450 is primary and 760 in x4 you cannot pass the 6450 to a VM (and maybe also the 760) Your GA-970A-DS3P doesnt have IGP. If you cannot pass the 6450 that effectively confirms that IF I get an X99 mobo I would need a crappy card for console (in primary slot) plus any GPUs I want to pass.... Sorry if I am labouring the point a little!! Huh? The AMD card worked in both slots passing through to a VM. AMD cards mostly works to pass through to a VM as the primary card. Nvidia cards doesn't want to passed through. If you read through the forum, you will see that others have the same experience.
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