RE: 1080 throttling. Recent reviews show that this is not the case, really. They OC just great. And the custom cooled cards are breaking through 2ghz with ease on air. So threadcrappers can crap themselves.
I've been checking the overclock.net owners thread. IMHO that is the thread to go to for any major overclocking efforts. It seems 2ghz is doable. Getting much higher than that not so much.