the information is pretty clear, bth wii u edram and xbox 360 edram were made by the same vendor, meaning NEC which fused with renesas, the article from bob paterson says that xbox 360 edram was made of 4 macros each of 500mhz and 1024bits bus width, with that you get 256GB/s(of course that since only the ROPS are in the same die with the edram only them have full access to this bandwidt while the gpu has to communicate via an external bus of 32GB/s, the wii u gpu and edram are in the same die chip silicon so it has full access to the total bandwidth of the edram). The chipworks photo showws that wii u edram is made out of 8 macros, so if we at least suppose something as old as the xbox 360 edram design, then we get 563.2GB/s with the 1024bits per macro and the 550mhz
we must remenber that renesa alreadysaid that wii u edram is using their best technology from the plant of NEC, so this news should come as no surprise, and sony already said that ps4 was going o use an edram of 1 terabyte, meaning that there should exist something like 2048biits per macro but we should sonsider the minium for now
now lets not confuse, edram bandwidth aint power
