Hello Everyone for those who has ASUS ROG Strix GeForce RTX 2080 Super here it's the vbios i've modified to work with gpu passthrough just de-attach the type-c usb controller and the Serial bus controller from the unraid boot by looking at your GPU IOMMU group onto TOOLS > System Devices.
Asus.RTX2080Super.8192.190709_dump.rom
and then go to your Flash device settings and add those GPU IOMMU ID's to de-attach them from the unraid boot MAIN > Click on Flash Boot Device > Scroll down and add them to the Unraid OS separed by comma
append initrd=/bzroot vfio-pci.ids=XXXX:XXXX,XXXX:XXXX
click on apply, done and reboot
IMPORTANT NOTE: don't forget to pass the nvidia HDMI sound card as well, otherwise will not work.
here is my xml of my win 10 vm if you need it
windows10_2080super_passthrough.xml