same problem is with mine.
i just installed sierra 10.12.6 today. everything works fine except the asus gtx1080 graphic card. it just wont detect it.
i have the lilu.kext and nvidiafixup one too, i tried all iMac 14,1 and 14,2 and 17,1 and 18,1 and many none work. i have web drivers enabled in...