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Intrinsic said:

You do know that the OG PS4 and PS4pro both use and support mixed Ram right?

No they don't. The additional ddr3 is not connected to the APU, it is connected to a secondary ARM-type chip that supports some bachground/sleep mode tasks with its lonely ddr3 memory chip. There is no ddr3 interface in the APU, obviously there is an APU/ARM connection somewhere.