Something technical to read here, but i have quoted a point that stood out for me that i found on Neowin.
Quote:
Main Memory Speeds, Feeds, and Coherency:
The CPUs connect to four 64b wide 2GB DDR3-2133 channels for a grand total of 68GB/sec bandwidth. Do note that this number exactly matches the width of a single on-die memory block. One interesting thing to note is that the speed of the CPU MMU’s coherent link to the DRAM controller is only 30GBps, something that strongly suggests that Microsoft sticks with Jaguar’s half-clock speed NB. If the NB to DRAM controller is 256b/32B wide, that would mean it runs at about 938MHz, 1.88GHz if it is 128b/16B wide.
SemiAccurate would be very surprised if it was 128b wide, wires are cheap, power saving areas not. Why is this important? Unless Microsoft’s XBox One architects are masochists that enjoy doing needless and annoying work they would not have reinvented the wheel and put an arbitrarily clockable asynchronous interface between the NB and the CPU cores/L2s. Added complexity, lowered performance, and die penalty for absolutely no useful upside is not a good architectural decision. That means the XBox One’s 8 Jaguar cores are clocked at ~1.9GHz, something that wasn’t announced at Hot Chips. Now you know.
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People are saying this means that MS bumped up the CPU speed as well as the GPU speed which was announced a little while ago and there is a hell of alot of custom stuff in there, hopefully it is good news.
http://semiaccurate.com/2013/08/29/a...-architecture/
http://www.neowin.net/forum/topic/11...entry595911163