I measured the external temperatures of the four quadrants of the notebook after 40 loops of 3DMark's Fire Strike Extreme stress test. This amount of time is more than enough to get an idea of your average maximum running temperature for this workload.
CPU and GPU temperatures were in line with expectations, and were actually slightly better than the competition. Similarly, surface temperatures appear quite comfortable, but these measurements were taken in an air-conditioned environment, and as I noted earlier, the palm rests can still get quite hot when the AC isn't running.
I used the built-in battery life benchmark in PCMark 8 Home to assess the battery life on the laptops. Ultimately, the large 80Wh battery on the Razer Blade means it can spend a decent amount of time away from a power outlet, but it was still outdone by the even larger 94.24Wh battery on the Gigabyte Aero 15X.
However, it's still miles ahead of most of the competition, so I'd consider this a fairly good showing overall.
The portability index is an objective measure of how portable a notebook is, taking into account factors like size, weight, and battery life.
With such svelte dimensions and decent battery life, the Razer Blade is without doubt one of the more portable gaming notebooks you can buy. The Gigabyte Aero 15X may still come out ahead thanks to its particularly outstanding battery performance and slightly lighter weight, but the Blade is definitely no slouch in this department.
It's not often you see a gaming laptop that can be feasibly used away from a power socket, so it's nice to see Razer paying attention to this area.