I am trying to add a Nvidia GPU to my VM as the Primary GPU,  I have create the Vm, using the default VNC and no Sound, but now I am trying to add the sound and GPU.   I have checked my IOMMU, and discovered that I need to set change the PCIE witin the VM so I did the following   in the Vm Manager I change the PCIe ACS Overide to Both   resulting with this within my  IOMMU     then I added the GPU Nividia Geforce GTX card, to my VM and boote