For the record, I had dealt with this problem too, boots fine on 4.5.* but not
4.6 (as of today). I have also tried a GTX 960 and a GTX 980 (4GB) (now my
current). Fedora 24 boots fine with each of those cards on 4.6. The EVGA GTX
970 (4GB) did not boot (at all) on kernel 4.6. However it will boot under 4.5
but the monitor(s) connected to the 970 card will not work. (I run two cards).