Hi!
I have almost the same board. Asrock N3700M-ITX. Got 2GB RAM installed, no addon cards like you. I still haven't tested everything but what I wanted to say is that I'm using one WD RED 3.0 TB without problems so far. Version 5592.
I hope I get the time to finish setting it up tonite so I can post results here. You should maybe test those drives you've got.