There were internet rumours weeks ago which suggested that the new ps3 models might be having the 65nm RSX chips. Well edepot now confirms that the newer models are indeed carrying the shrunk RSX chips
Updates:
The rumour first emerged at some tech websites where random users noted less power consumption with the newer models
Edepot basically confirms the rumour
http://www.engadget.com/2008/08/23/new-80gb-playstation-3-provides-minimal-power-savings-might-hav/