Xbox 360 + ATI interview
 

But actually I do think Nvidia will have a unified shader architecture by the time WGF2 comes around. This time around, they don’t have the architecture and we do, so they have to knock it and say it isn’t worthwhile.

The old terminology of ‘SMA (Shared Memory Architecture)’ simply doesn’t do justice to the flexibility and power of the Xbox 360. SMA is a term we have inherited from the PC and it usually has some negative connotations, but the Xbox 360 is really nothing like that.

Microsoft has implemented compatibility purely through emulation (at the CPU level). It looks like emulation profiles for each game are going to be stored on the hard drive, and I imagine that a certain number will ship with the system.

http://www.bit-tech.net/preview/bits...ddy_ati/1.html