I have the same CPU and a similar motherboard as you. I tried to set my SMBIOS to iMacPro1,1 and disabled IGPU in BIOS. I also had the dummy152.kext but I still couldn't get my HEVC encoding working. Do you have any suggestions?
I have a computer dual boot with MacOS 10.13.2 and windows 10. The graphics card is GTX 710.
When I ran Novabench under MacOS. The OpenCL shows 0 GFLOPS. Under Windows 10, it shows 263 GFLOPs. When I tried to run darktable (an image editor) under MacOS, the OpenCL is disabled.
Is there a way...