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[Kleegamefan]

 

[Hitler Stole My Potato]

Here's a flow chart I found on Google:

 

[gofreak]

It's not entirely clear yet, I don't think, how the CPU access main memory (e.g. through the GPU, or directly itself)..

 

[Elios83]

That is an interesting diagram,if true there's some logic in the embedded Ram chip and the 256GB/s bandwidth is between this logic and the actual embedded Ram but the bandwidth between GPU and e-memory chip is 48GB/s.
Now I wonder what are the functions that they want to speed up putting logic in the memory chip? AA apart of course.

 

[gofreak]

That is an interesting diagram,if true there's some logic in the embedded Ram chip and the 256GB/s bandwidth is between this logic and the actual embedded Ram but the bandwidth between GPU and e-memory chip is 48GB/s.
Now I wonder what are the functions that they want to speed up putting logic in the memory chip? AA apart of course.

This was already reported on, it's the "Smart3D" edram with logic for AA, blending, z-compare etc. The stuff that would make sense for a framebuffer.

 

[Elios83]

This was already reported on, it's the "Smart3D" edram with logic for AA, blending, z-compare etc. The stuff that would make sense for a framebuffer.

I see thanks

 

[CaptainABAB]

From http://www.anandtech.com/printarticle.aspx?i=2423

Microsoft announced that the 10MB of embedded DRAM has 256GB/s of bandwidth availble to it; keep this figure in mind, as its meaning isn't as clear cut as it may sound.

The daughter die is where the 10MB of embedded DRAM resides, but there is also a great deal of logic on the daughter die alongside the memory. The daughter die features 192 floating point units that are responsible for a lot of the work in sampling for AA among other things.

Remember the 256GB/s bandwidth figure from earlier? It turns out that that's not how much bandwidth is between the parent and daughter die, but rather the bandwidth available to this array of 192 floating point units on the daughter die itself. Clever use of words, no?

Because of the extremely large amount of bandwidth available both between the parent and daughter die as well as between the embedded DRAM and its FPUs, multi-sample AA is essentially free at 720p and 1080p in the Xbox 360. If you're wondering why Microsoft is insisting that all games will have AA enabled, this is why.