I'm sure I will regret this, but I'm going to answer your question anyway.

927w with a platinum PSU. This is the one area in which BFL is clearly superior. With an identical PSU(Antec 1300w platinum) four BFL Single SCs draw just under 1100w and hash at around 375Gh/s(after mods to their crappy stock cooling). The minirig SC has twin EVGA classified 1500w PSUs and it draws almost exactly 2x this amount.

If you think this is a huge advantage for BFL gear however, then you'd be mistaken. Bitfury has claimed that the first of their finished products have shipped today and this will mark the end of BFL's superiority in the efficiency department, even while the vast majority of their customers victims still await the products they paid for months ago. Operating cost differences between these two products will end up being nearly meaningless IMO. This is why I've chosen to add more hashing power in the form of cheaper and more readily available secondary market Avalons.