I would like to point out that per following page
http://hashfast.com/shop/chipsales/Hashing Output: Up to 800 GH/s (overclocked)
Hashing Output: 400 GH/s (nominal)
those are the same chips that will go into Yoli Evo boards that are advertized as
Typical Bitcoin Mining Performance: 675 GH/s +/- 20% [540-810 GH/s]
That above 400 GH/s performance is from already overclocking the equipment. Since MPP supposed to be based on nominal hashing rate of 400 GH/s and not on overclocked rate and be 4x not 2-3x of overclocked board.
Also, how are you supposed to cool 675 GH/s ~ 740W board ?