Just to make this clear for anyone that has a VEGA 56, VEGA 64 or VEGA FRONTIER: Your best option is SMBIOS iMacPro1,1, and there is no need for any headless iGPU configuration at all. You will not need your iGPU at all, because your Vega ist just much faster! Don’t slow down your system by using a configuration that is made for a much weaker GPU! Don’t use iMac 18,1, iMac 18,3 or macMini or whatever. Use iMacPro1,1, if you have Vega 56, 64 or Frontier. Using the iMacPro SMBIOS there is NO NEED to have iGPU enabled for hardware acceleration and proper Final Cut encoding at all. The iMac Pro doesn’t have an iGPU either! Just use WhateverGreen and Lilu (and a good PowerPlayTable for fan behavior of your Vega) and you’re done!