It seems the read speed doesn't make any difference for mining. Desktop - around 320+mb/s Nuc - around 150mb/s Both on USB3 with 4 drives. The result is about same. And I don't know why there is so much difference in read speed btw the systems. i5 4690K vs i5 6260U There are a lot crappy stuff going for months on dev team, and not sure how it affect the value of coin going forward. Not a good sign.