HashFast: we are all very happy and excited for you that your new boards get 750GH.
No we aren't. These liquid nitrogen cooled chips are large but inefficient. 2w/gh means bitfury is twice as efficient. Die size means nothing if your chips are garbage.
I would rather have 1000 2.6gh bitfury chips than a single giant 2000 gh/s hashslow chip that requires a nuclear powerplant to power it.