Just to thank all for providing amazing guides here, I successfully installed Sierra GM (323) on this Silverlake board.
Motherboard: GA-Z170X-Ultra Gaming
Graphics: Nvidia 950 GTX
Processor: i7 6700
SSD: X400 256 GB x2, NVMe Samsung 950 Pro
Bluetooth: IOGEAR Bluetooth 4.0 USB Micro Adapter (GBU521)
Sound: Onboard Realtek ALC 892
LAN: Onboard Intel i219 GbE LAN
Memory: Corsair Vengeance LPX 16GB (2x8GB) DDR4 DRAM 3000MHz (PC4-24000) C15 Memory Kit
Working iMessage, USB 3.0, Audio, Bluetooth...
[SUCCESS] SilverLake Sierra GM GA-170X-Ultra Gaming Nvidia 950GTX
Motherboard: GA-Z170X-Ultra Gaming
Graphics: Nvidia 950 GTX
Processor: i7 6700
SSD: X400 256 GB x2, NVMe Samsung 950 Pro
Bluetooth: IOGEAR Bluetooth 4.0 USB Micro Adapter (GBU521)
Sound: Onboard Realtek ALC 892
LAN: Onboard Intel i219 GbE LAN
Memory: Corsair Vengeance LPX 16GB (2x8GB) DDR4 DRAM 3000MHz (PC4-24000) C15 Memory Kit
Working iMessage, USB 3.0, Audio, Bluetooth...
[SUCCESS] SilverLake Sierra GM GA-170X-Ultra Gaming Nvidia 950GTX