So far, Nintendo has yet to release detailed 3D specs. Many people were surprised at the system's performance in the first place because they
thought they knew where to gauge its power. I've been hearing about this combination of a GBA processor and a new Arms processor, but I still don't believe there's any disparity between the two chips besides one having more logic gates for new features like touch screen.
(I also find it a bit impractical to have such a varying power between processors especially when you intend to introduce gaming enhancements like dual camera views. Also remember that talking about Arms processors without fine details can be meaningless.. I can't remember, but I believe there's an Arms-9 in N-gage too.. if it's indeed true, then well...point made).
Finally...
"[i]Each 3-inch screen can reproduce a true 3-D view and is backlit to assure comfortable play in any lighting condition."
http://www.nintendo.com/e3_2004/ds/ds_overview.jsp
being that the screen isn't what's responsible for the 3D illusion, that seems to imply that each processor(tied to either screen) can produce "true" 3D.
Of course, nothing I posted was 100% concrete, just what I thought to be practical and what I concluded to be solid implications. But hey, I'd be glad if I someone link me to some detailed and factual info and clear this whole thing up.