"* To be precise, there is 4gb GDDR5 on the GPU and 8gb GDDR5 on the 8-Core IBM custom CPU."
GDDR5 stands for Graphics Double Data Rate, version 5, it's RAM for video cards. As per the name, GDDR5 is found in graphics chips. It would not be on the CPU. If fact, RAM is generally not on the CPU, that's what CPU cache is for. Whoever wrote this rumor clearly has no idea what they are talking about. At all.
I advise all of you to not take get too carried away with focusing on RAM. 2gb of GDDR5 RAM is considered very high end for current gaming PCs. The $1000 GTX Titan uses an absurd 6gb of GDDR5. The only reason the PS4 is going with 8gb of GDDR5 is because is because it plans to utilize it in lieu of system memory (what people know as DDR3) which is possible because it is a dedicated gaming system and generally doesn't have to worry too much about large scale multi-tasking and CPU intensive applications.
