"Any, the age old myth from the bedroom experts that the PS4 has an off the shelf GPU."
It IS an OTS system, with some minor adjustments. AMD has been selling their APU CPU/GPU combos for years before the PS4 came along, and GDDR5 was nothing new, either. Thing is, GDDR has a graphics-oriented performance optimization which is why it isn't used with standard DDR memory channels. Both the PS4 and Xbox One are customized to some extent, but neither really use cutting-edge hardware (that still belongs to the realm of gaming PCs) that could be considered novel or revolutionary. Even the PS3's Cell architecture got leapfrogged early into its working life with the GPGPU push culminating with the release of OpenCL.