Your made-up math alone leaves a 20-90 dollar per-unit gap in RAM costs.
Are you sure there's not some wiggle room to fit R&D in the production savings across 70 million units?
and where's the logic thinking that microsoft that is a money-burner have to reduce of few dollars the price of the console, making it inferior and *more difficult to develop for*, while sony that have money problems in all its sectors, can burn money in a 18-cu gpu and 8 GB of gddr5?
is the world turned upside-down?
unless the 599 US dollars will repeat