I think, after looking to these prices, that Phenom will be slower than Penryn

The question is how much, and how will it be the ratio price/perfomance of a system based on a Phenom+RD790+GPU

and one based on a Penryn+X38/48+GPU.

Another thing, from 2.2 to 2.3 GHz the TDP remains the same, but from 2.3 to 2.4 GHz we have a TDP increase of 30 W? Why?

Good prices, though...