By the way, if you want to contribute and give me the benchmarks of your non-listed devices here's how to proceed :

- iOS :
- Download Stockfish on the Appstore.
- chose "game -> new game -> analysis"
- wait for one minute so the figures stabilizes, and you've got the NPS measurement in kN/s. (Kilo Nodes per seconds).

- Android :
- Download Droidfish on the PlayStore.
- launch the game and go into its parameters : make sure "pondering" and "Display the computer's evaluation" are checked.
- in the "execution tasks" part of the settings, make sure it is set to the number of cores your device has.
- Now launch a new game as white and wait a minute so you get a good measurement.

On my iPad Mini 2 I get Around 1100 Kn/s (> 1.100.000 nodes /seconds), and on my Galaxy Note 3 I get around 480 Kns.

If you possess devices not listed above, please do this test and I'll update the charts (Thorsten and I are the main authors of these charts.)