I'm very skeptical we'll be able to overclock these, reason being there are 3 hashboards, not 4 (maybe I'm the only one who presumed that it'd be 4, given it was 4 times the speed of a Mini?), and each of these boards is running about 15 KSols/s.  In effect, I think we're dealing with the equivalent of three overclocked Z9 Minis in one box, so there's no where to go.  Obviously I could be way off (I'd prefer that, actually) but so far, I'm not hopeful.