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I'm not speaking with some deep benchmark testing knowledge of the ps4, but I doubt RAM is a real bottleneck issue in terms of clock speed. As RAM goes today, limited address space (not enough GBs of RAM) would be the biggest bottleneck because of paging in and out of primary memory to a secondary storage (HDD). Computers in general typically have their biggest bottleneck with optical media R/W and magnetic HDD R/W. That's why if you replace your computer's hard disk with a solid state drive you see such great performance gains.