A few days ago, there was a rumor saying that there will be 5.5GB of dedicated RAM or 3.5GB to developers alone, but that's not the case. Sony has clarified that 3.5GB RAM will be dedicated while an additional 1GB will be available as flexible memory, the rest being used for the PS4 OS.
Via Inquisitr
Last week, a report from Digital Foundry claimed that while the PlayStation 4 would come equipped with 8GB of DDR5 RAM, only a little over half of that would be available to use by developers. To put speculation to rest, Sony decided to offer some clarification.
Via Inquisitr