what do you think are the move engines in combination with eSRAM and DDR3 good for then? of course eSRAM is going to be used like a GPU cache. its not SRAM for nothing. i mean, we can of course discuss now if it has to be called a cache or like the name says, embeded static ram. if i call it a programmable gpu cache, i am not too far off.
-> http://www.extremetech.com/gaming/171735-xbox-one-apu-reverse-engineered-reveals-sram-as-the-reason-for-small-gpu they call it cache
http://hothardware.com/News/Developers-Claim-Xbox-One-Much-Weaker-Than-PS4-We-Evaluate-The-Evidence/ they too btw.
-> http://www.eurogamer.net/articles/digitalfoundry-the-complete-xbox-one-interview this article states that its very similar to eDRAM
Edit:
-> http://semiaccurate.com/2013/05/22/microsoft-subtly-admits-losing-with-xbox-one/ even though this article is a little outdated (may 22, 2013), it has a great understanding of x1s architecture (eSRAM again called a cache)







