Installing Sierra on a Desktop with no IGPU, only a GTX 960.

My desktop has no internal gpu. It only has the troublesome GTX 9XX series. https://www.reddit.com/r/hackintosh/comments/4te84y/macos_sierra_hackintosh_gpu_boot_issue/
I have a Xeon powered workstation which doesn't come with Intel Graphics sadly.

I get the cancel symbol. My error can't be fixed in safe mode.

Thanks!