28nm fermi your eyes dont decieve you.
their primary focus for the gtx 600 series is energy efficiency and preformance per watt. not preformance. kepler wont be till the 700 series. HOWEVER not all is lsot for nvidia folks as kepler will be present in their mobility market.
this is further reinforced by the gtx 600 series codenumbers..
while too early to write nvidia off at the sound of this, we can certainly say that this doesnt look good.