Radeon/Nvidia VMDirectPath

Hi

I am toying with the idea of using my NASA spec'd workstation as a multi-role hypervisor for 3d gaming, media and general stuff.

With this in mind, does anyone know if the AMD Radeon R9 290x is capable of being passed through to a Guest VM using vmdirectpath? Would there be a significant performance drop in DX11 gaming if so?

Also, I am under the impression that to passthrough a Nvidia GTX 780 or equivalent, you need to use Nvidia's grid/k series cards for full virtualization and pass through capabilities, is this true?

Thanks in advance.

-Michael