Okay, so if we suppose these are "full production" parts and not binned, is it reasonable to use the die area to compare cost against the desktop equivalent?The cost argument can be modified depending on the design.
It was intimated earlier that AMD designed the smaller chips with mobile as the primary target.
If the design is targeted so that its size and yield curve is a better match for the mobile market, then the component of the cost that is related to special binning is reduced, because acceptable chips become the baseline instead of being the exception.