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The PS3 had a custom 7800 series GPU which was slightly slower than the regular one. Remember it was an upper midrange GPU released one year before the PS3, so if they were to do that again, they should be aiming for something with performance similar to a midrange GPU released this year namely a 7850.
So the PS4 having a discrete card paired with the APU makes sense otherwise it wouldn't reach the performance target.
But this is just a theory.
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