brontosaurus,

I got to work BitFury chips 55nm rev.1 at 0.4w/gh. I'm not a strong developer. Is not the limit.
These chips are fabulous and gorgeous. 55nm rev.2 even better. I have no doubt, that all this reality.

But now, non-BitFury miners in a bad position, because they have no chance to compete.

2Spondoolies-Tech,

I don't have this image. This 55nm? Or 28nm, 16nm?
IMHO. Now, as two years ago. The only key parameter - w/Gh.

My miners on BitFury chips 55nm rev1(2) successfully work all the time and will work much more. Energy efficiency greater than non-downclock Spondoolies-Tech LTD «RockerBox» or BM1384. GH/mm^2 - minor optimization. A3255 and A3233 better BF756C55 at Gh/mm^2. But... They are turned off. Energy consumption.

Currently we do not have the choice of equipment. KnC, BitFury, Spondoolies-Tech not for sale. Miners can not go far on old-technology in downclock chips.