Most developers didn't even know much RAM PS4 was going to have until the reveal in February. That's how late the decision was made. They basically custom-built the chipset to support it and forecast that by launch it would be financially/physically viable enough to do. There aren't even PC chipsets able to support 8GB of GDDR5 on a single board yet. Initial reports say a lot of it will be idle and wasted though, since the GPU could really only handle half of that at best. It's basically there to ensure all the background functions and OS features work as instantly as possible.
Xbox One Vs Playstation 4 Hardware Performance & GPU, CPU & Memory Analysis
Of course, it won't be long before PCs outpace that amount of memory. But to have all that in a console is still pretty good leverage for the future.
Great info bro... This just further substantiates the advantage the ps4 has... Xbox has a lot of things going on that lead me to believe there are going to be ongoing issues and ps4 has everything looking on point... It seems that the ps4 is catered more to gamers than the xbox... Im really looking forward to getting it! I pre ordered the console, a second controller, nba 2k and drive club as well...