Thank you for enduring my bad English, first. ^ _^ ; I used KVM with libvirt (virt-manager) and 'migrated' to Proxmox recently. I had succeeded GPU passthrough in libvirt with win7 win8.1 win10 but now I just do it with win10 with Proxmox. (win 10 seems very easy as it requires 'almost' only GPU rom) Win 8.1 seems to be easy but it isn't because it looks succeeded but the screen display isn't although it shows menu "Nvidia Control Panel" and 3d accelated Chrome doesn't show up (looks white blank screen. Win 7 is stuck on boot ( I suppose with cpu usage because I can't look at without VNC) My settings is .... machine: q35 hostpci0: 01:00.0;01:00.1, pcie=1, x-vga=on, romfile=1.rom ..... - pre-required works are done (iommu, vfio, acs patch, rom file ......) - installed Win 7 as UEFI with OVMF - boot option edited with boot up screen and set only "PCI-E Device" boot - manually updated kernel and qemu-kvm - added efi disk I set almost similar circumtances with similar options as libvirt with virt-manager, but just stuck on boot in Proxmox Is there any hints? Thanks in advance.