Crysis 3 developer Crytek has stated that Xbox 720 and PS4 must have a minimum of 8 GB RAM in-order to ensure maximum performance.
In a recent interview to VideoGamer, Crytek head Cevat Yerli console memory is "the single most important thing that is always going to be underbalanced – I’ve never seen a console where the memory was the right balance."
Cevat was refering to Xbox 360 and PS3, but further stated that the reason behind was the high cost of memory in console production stage.
Cevat then suggested that Xbox 720 and PS4 may arrive with 8GB RAM or even more. He said that both Sony and Microsoft could “quadruple (the) memory” of PS4 and Xbox 720 if they can find ways to cheapen the cost (of memory) to a degree.
In this latest interview of Cevat Yerli, PS4 and Xbox 720 was a major talking point. You can read full interview HERE.