Some specs from a leaked slide
|32nm SOI||90nm then 65nm now 45nm||Runs cooler|
|4 OoO cores||3 in-order cores||More cores, more efficient|
|4 SMT per core||2 SMT per core||More efficiency|
|3.2GHz max in Turbocore mode||3.2GHz||Same but chip could do more per clock|
|512 KiB L2 cache per core||1024 KiB L2 total||More in total, what about snooping?|
|4 enhanced VMX128 cores||3 enhanced VMX128 cores||More is better|
|80MiB EDRAM||10MiB EDRAM||X720 can support 10 32bit 1080p rendertargets
This allows for some FAT gbuffers and Stereo 1080p
|EDRAM accessible by CPU, VMX and GPU||EDRAM only accessible by GPU||This is a game-changer! Now this ultra-high-speed memory is accessible for general purpose (CPU) and stream processing (VMX) it opens up a whole new world of possibilities|
|Bluray Hardware Decoder||No Bluray anything||Bluray makes sense|
|DX11.1||DX9 + extensions||All the DX11 goodies plus native Stereo support and DirectCompute …|
In general this is just an improved version of the X360 chip. The really exciting thing is the “80MiB EDRAM shared with the GPU” as that could lead to all-new techniques that are unique to the XBOX 720.
The really exciting thing for XBOX 720 is the combination of Kinect2 with 1080p stereo … think about reaching out and touching virtual objects floating around you … actually punching a game character in the face etc.