Thank you for all the information! That is good stuff to know!
For my personal x99 system (X99A MSI Gaming Pro Carbon, i7 6950x, 980 Ti), I have tried: -v, -x, dart=0, cpus=1, npci=0x2000, npci=0x3000, -xcpm, slide=0, kext-dev-mode=1, debug=0x100, nv_disable=1, rootless=0, debug=0x14e...