Here's some basic MAX numbers from GPU-Z.
The "PerfCap Reason" is usually power. I haven't installed EVGA Precision X1 yet, going to take at least a couple days to gauge stock behavior before messing around. The clock seems to typically run about 1770 MHz in game.
Overall, after a few hours of gaming tonight in Ark and DayZ, I'm pretty thrilled. The "roughly double" fps prediction seems to be panning out in most circumstances. I'd managed to make myself forget how big of a deal it is to nearly always run a good margin above 60fps.