Overview   (Disclaimer: The following is for techies only that like to dig a bit deeper. And if you're not interested in energy-efficient servers then probably this is just a waste of time  )    EDIT: Half a year after this poorly designed SBC has been released just one of the many design flaws has been fixed: Micro USB for DC-IN has been replaced by the barrel jack that was present on the pre-production batches. If you were unfortunate to get a Micro USB equipped M3 please h