You don't get my point.
All we know is that all listed phenom2 cpu's will have 125watt TDP, and when overclocked Deneb needs more voltage then Nehalem, as far as we know. So I don't see moderate power consumption happening with these chips. Even with lower clocked Phenom2 cpu's TDP's won't be under 95, an what's the point having a low clocked CPU?

A Deneb cruncher can be cheaper then a I7 crunchr, just because everything you need for a Deneb system will be cheaper.