i was able to successfully install sierra on it, with few X99 patches
what works:
- NVIDIA Quadro k420 works very well with native OSX driver.
- Audio is Realtech ALC221 works fine with Voodoo driver.
- Ethernet works fine.
- CPU model is recognized correctly.
what doesn't work:
- CPU power management seems only work with NullCPUPowerManagement.kext and patched SSDT, no native power management support at the moment.
I didn't patch the DSDT, but it seems everything works just fine. and I am attaching the clover folder here hopefully it could help someone.
View attachment 292877