I removed the line. That's my actual config:
bios: ovmf
boot: dcn
bootdisk: scsi0
cores: 6
cpu: host,hidden=1,flags=+pcid,hv-vendor-id=proxmox
efidisk0: HDD500GB:vm-103-disk-1,size=128K
hostpci0: 04:00,x-vga=1,pcie=1,romfile=Asus.GT710.2048.170525.rom
hostpci1: 04:00.1,pcie=1
ide2...