Write a benchmark of similar devices

Gather information about similar devices.

Indicative due date : July 30th, 2017

Criteria to close the issue :

- fork the repo
- edit the file references/benchmark/benchmark_1.md with a summary of your findings. 
- if you want to benchmark more devices, just create benchmark_2.md etc... in references/benchmark/ and add them in the SUMMARY.md
- make a pull request refering to this issue