Vision G (BIOS f20), Gigabyte RX 580,
Last EFI for Vison G from Hackindrom, SMBIOS iMacPro 1,1.
Problems with video output through DisplayPort. It shows only 1080p on my 2K monitor. Through HDMI resolution is correct.
Along this, GPU is fully supported (videoproc, FCPX, LUXmark are OK).
I tried...