The powerlimit I have set is more of a failsafe, when the thermal limit gets broken.
On the GTX 1080 i didn't use the power limit, but the thermal limit instead, and it worked very well (power limit was at 100%).
So i used the same strategy on the Titan X, but that didn't go as planned.
So I did a +175 Mhz core clock offset, a 70C thermal limit and an additional 50% power limit, which gives me a 0.6810 core voltage, and a 72C temperature.
Fan speed at +/- 2065 rpm, which I am happy with.
Average power usage is at 44% TDP or 108W board power draw.
This is at this moment, but it can vary somewhat, depending on the type of workunit given.