Yes it is possible and works.
1) check that the pins match on the adapter and the media.
2) Update the BIOS before revision F6a https://www.gigabyte.com/MicroSite/462/images/BIOS-Z270P-D3.zip
3) Set some setting in the BIOS




4) Enjoy of working 7 GPUs
Thank link isnt for the f6a version. Its the f8a version. 1) check that the pins match on the adapter and the media.
2) Update the BIOS before revision F6a https://www.gigabyte.com/MicroSite/462/images/BIOS-Z270P-D3.zip
3) Set some setting in the BIOS




4) Enjoy of working 7 GPUs
