[EurogamerDF] Orbis Unmasked: what to expect from the next-gen PlayStation

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disolitude said:

Also, there is no way microsoft will use DDR3 memory only. They will most likely have DDR3 or 4 for system and GDDR5 for GPU.

why would microsoft go from a unified ram structure (which they were applauded for by many devs throughout this gen) to a dedicated ram structure?