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Carl2291 said:
Its a boost to the lifespan of PS3.

Also, they wont have had the tech for a slimline version when PS3 released.

This.

The cost reductions come from die shrinks, motherboard shrinks, pretty much all internals getting shrank and now the exterior (for the Slim).  The shrinking only comes after a mature manufacturing process.  In other words, it would have been a lot harder and taken them a lot longer to produce PS3's if they had wanted to start out with 45nm chips.