GPU Spoofing doesn't work for MacPro 6,1

The tutorial https://dortania.github.io/Getting-Started-With-ACPI/Universal/spoof.html should work for most cases, but not mine. I solved it with other workarounds.
My SMBIOS is MacPro 6,1, dual socket IVB-E, and the original GPU ACPI Path is **PCI1.NPE7.GFX0**. I have tested that the only combination working for me is:
1. Change GPU from **GFX0** to **GFX1**, https://www.tonymacx86.com/threads/black-screen-with-macpro-6-1-or-imac-15-or-imac-17-system-definition.183113/
2. Inject fakeID in config.plist https://dortania.github.io/OpenCore-Install-Guide/clover-conversion/Clover-config.html#graphics

The ACPI patch method won't work. Not sure if this problem is related to all MacPro SMBIOSes? Or because my GPU is attached to CPU2? Is there any more elegant way to solve this?