According to Generation Eight.com:
A new rumor started based on a supposedly leaked internal Sony document detailing the specifications of the PS4. First off, I would be willing to bet my bottom-dollar that IF such a document really is detailed out somewhere at Sony's HQ, it is guarded very heavily, maybe even under penalty of death for looking at it without authorization? Okay, jokes aside, the point is, sheets like this very rarely prove real, but it DOES occasionally happen.
So why call this one out as fake? There are a few big reasons why, five in total.