@gmason Regarding those server boards, maybe they might be good; though you'll get a good shot to test it. Definitely let us know your results. I had checked into
Sun Microsystems t5140, though I have decided not to pursue getting it up and running, esp as it is not efficient in exchange for raspberry pi and jetson tk1 and odroids as my first trial for farming.
There are a few other machines I have for testing though they are each in the low power consumption level.
@faddat I hope to be able to use phones for farming, this way remote people can definitely earn coins from farming and have plenty of credit for putting data, etc.