Artifacts on the monitor screen when installing a Windows 10 guest OS in Proxmox. How to overcome?

Question

Iron

Hello gentlemen. I removed the vBIOS of the only integrated Intel UHD 605 video card in the system from the UEFI firmware of the motherboard and forwarded the video card inside the virtual machine on Proxmox. When starting the virtual machine, the image on the monitor screen successfully appeared (without specifying the vBIOS file in the virtual machine configuration, the image did not appear!). Now I'm trying to install Windows 10 as a guest OS. Everything would be fine, but only during the installation process the image invariably deteriorates. At the same time, after 10-15 seconds, the installation process is inevitably interrupted with an error message or BSOD (with the output of various errors). I am attaching photos of the monitor screen with the process: I



am also attaching a video on YouTube

The current virtual machine configuration file /etc/pve/qemu-server/100.conf

agent: 1
args: -device vfio-pci,host=0000:00:02.0,id=hostpci0,addr=0x02,romfile=uhd605_vbios.rom
boot: dc
bootdisk: sata1
cores: 4
cpu: host
machine: q35
memory: 2048
name: Windows10
net0: rtl8139=A2:14:83:CD:2E:2A,bridge=vmbr0,firewall=1,link_down=1
ostype: win10
sata0: local:iso/windows10.iso,media=cdrom,size=4171424K
sata1: local:100/vm-100-disk-0.qcow2,size=32G
scsihw: virtio-scsi-pci
smbios1: uuid=18afecfa-fd48-4314-a226-002bf9d3705f
sockets: 1
usb0: host=0e6a:02c0
usb1: host=062a:0000
vga: none
vmgenid: eab28f6a-5812-43b5-b088-f44f9d6e2462

I paid attention to this moment: if you allocate 1 GB of RAM to the virtual machine, then nothing is displayed on the monitor screen when the virtual machine starts. If you allocate 2 GB, then the image is there, but when installing Windows 10, the image deteriorates at 1% of the "Preparing files for installation" stage. When allocating 4 GB, the image deteriorates by 14% of the process, with 5 GB - by 23%, with 10 GB - by 60%, etc. In general, the more RAM is allocated to the virtual machine, the later the image will deteriorate and the installation will be interrupted.

Tell me, please, what could be the reason and is there an effective method of treatment?