Power Consumption & Noise
We used a power meter to measure the amount of power our test system pulled from the wall outlet. You'll find two figures below: peak power consumption under a full CPU/GPU load, and how much the system pulled from the wall when idle, following a fresh system boot.
The refreshed XPS 18 Portable AIO with Haswell inside is a more powerful machine than last year's model, but even with that being the case, it drew less power from the outlet. How so? One reason is because the architecture is more efficient, which is one of the reasons why Haswell is so highly regarded. And second, swapping out a mechanical hard drive flanked by an mSATA SSD for a dedicated SSD solution lessens the power demands as well.
Straight and to the point, noise is nearly non-existent here. Even at load, nary a peep comes from the XPS 18 Portable AIO unless you put your ear right up to the vents, at which point you can hear a polite whisper. That's not surprising when you take in account the tablet form factor that's been molded in an AIO, but it's also impressive considering the amount of power inside.