Insider Daily. DDR3 RAM inside Xbox One acts like DDR4 from 2014 PCs and really have 272 GB/s BW (Misterxmedia)

[fatslob-:O]

ethomaz said:

drkohler said:

It means the gpu can have cache coherent access to the cpu memory. Notice there is no coherency between esram and cpu, though. Unfortunately there is this small, bidirectional, black arrow between cpu and esram. Nobody has yet figured out what this arrow means. As long as ms doesn't explain what that arrow is, all bets are off about full huma (ms's way of doing it) or not.

To start to think in hUMA we need to know if the CPU have coherent access to the GPU-cache... the diagram is clear about GPU having access to CPU-cache but what about the reverse?

After that we need to see how this eSRAM works... that black link is intersting but means nothing without more details :(

Well to answer your question the reverse has to also be true for the model to work. If you look at the diagram it clearly shows arrows pointing both ways which suggests that the cpu can access gpu cache. Like I said before that black link probably has to do with how the cpu is managing the cache and not using it.

Edit: It would be kinda dumb to not let the cpu have instant access to the results that the GPU computed.