Performance-Per-Watt & How The Raspberry Pi 2 + Pi Zero Compare To Old NetBurst CPUs

While the Raspberry Pi 2 goes through slightly more power, it's much more powerful and leads to dramatically greater power efficiency than the Raspberry Pi Zero. Here's some of those side-by-side comparisons on Raspbian 8.

You can see more of those differences via this OpenBenchmarking.org result file.