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I would be surprised if they did not have any die shrink. The bottom base is quite a bit smaller. It will be a bit of a disappointment if it is just motherboard changes and change of blu-ray drive.Uh... You do know that's a standard feature from the original fat PS3's, correct? But hmm, a 190W PS3, I don't think that drop would indicate that they are using a 28nm process for the RSX chip. I think the wattage drop is part of getting rid of the eject mechanism for the blu-ray drive.
Cell below 45nm is the hard part from what I read a year or so back. Actual power consumption in use, could potentially go down quite a lot if they have die shrinked both the CPU and GPU.