I have 30 identical desktops but two of them insist on having 8 S/s instead of 17. "top" looks the same as the others, hard drives seem OK, RAM swaps and checks were OK. I couldn't see anything in the log files, but I wouldn't know much about that. Any suggestions on how to diagnose?
BTW I can't just sell them and get GPUs because they haven't dropped in price for 6 months, and the electrical cost is only 3 W per S/s. R9 390's at 100 S/s doesn't bother me but 280x at 100 S/s I can only say ouch.