Exophase
Nothing good will ever come of Exophase.
15W tdp.
In the mobile world, tegra is a joke for power consumption.
Examining a peak power consumption number is meaningless without looking at performance. In fact, an entire perf vs power consumption curve should be examined because perf/W isn't linear.
Furthermore, you can't judge GPU power efficiency by looking at whole SoC power. It's possible that the GPU is a lot more efficient than the CPUs, for instance, and in Tegra X1's case there's probably something to this.