sieanr, the first picture in your posting is totally wrong. It would be like including the 300GB per second EIB internal CPU bandwidth which also connects the SPEs to their local memory stores.
With regard to the second image, maybe these developer quotes makes you understand its (non-) relevance:
"and it's a total non-issue. You never, ever need to access that memory from the Cell - I can think of some useful debugging things you might do with that access in the testing stage, but that's about it. In fact, on the PS2 you couldn't access that memory from the CPU at all, and it was never really a problem!"
"I can see a couple of reasons why you might want to use it," another developer told us, "but really, they're pretty obscure, and you could probably do them on the RSX anyway, since it's quite flexible. Besides, if you really need to access video memory from the Cell, you can use the RSX to copy it over into main memory really quickly - it's all there on the slide."
"I doubt a single person in the room batted an eyelid when they showed that slide," continued the first source. "It's exactly what we'd expect, and the bits that we actually need to use to make games are perfectly fast."
IMO both images have been abused by XBox 360 fans far too often.
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