Can't boot macOS with dual Xeon, only with a single CPU : chinese X79 Server V1.1

[Mazarinpolis]

Still can't boot

 

[Mazarinpolis]

Single CPU, I can boot macOS perfectly with Above 4G Decoding + npci=0x2000, finally

 

[EliteMacx86]

Still can't boot

With the updated config, what error do you see when booting?

 

[EliteMacx86]

Single CPU, I can boot macOS perfectly with Above 4G Decoding + npci=0x2000, finally

Try with iMacPro1,1 and then check if you're able to boot with both the CPUs. In addition, ensure that the CPUTscSync is up to date.