As a sidenote, when speaking about the bandwidth numbers, the memory bandwidth on Xbox One does seem to be at the same ballpark as Sony’s PlayStaton 4, right? While Microsoft touts over 200 GB/s memory subsystem bandwidth, so it should be better than the 176 GB/s number on PlayStation 4, right? All wrong. The devil is deep in the details, remember the large chunk of eSRAM for the graphics? So the Xbox One system uses 16 pieces of Micron “D9PNZ” DDR3 memory modules on-board, a little Google search give us the exact model number being
MT41J256M16HA-093, which is 4 Gbit density modules running at an I/O frequency at 1066 MHz, that’s DDR3-2133 data rate for those who don’t know, and these modules will provide 34.132 GB/s bandwidth under a dual-channel configuration. And thus, the eSRAM contributes over 166 GB/s bandwidth. However, the two numbers were added up for obvious marketing purpose, and in reality the two numbers should be seen in parallel with each other because, as we mentioned earlier, the GPU will treat the eSRAM as a very-fast last level cache, so the bandwidth here doesn’t serve the CPU cores at all.