vga gpu passthrough issue amd radeon rx 560 4gddr5

Hi all, I really need help. I've an up-to-date proxmox VE installation and I need to passthrough a GPU Card to a Windows 10 VM. Server : HP ML350 G6 with 2x Xeon GPU : AMD Radeon RX 560 4GDDR5 I've followed the steps in the wiki : _in /etc/default/grub , i've changed the line -->...