To add to this another little theory I have about the original Xbox compatibility. When Xbox first came out MS wasn't too strict on the TRC of titles, this is

To add to this another little theory I have about the original Xbox compatibility. When Xbox first came out MS wasn't too strict on the TRC of titles, this is why you saw some stuff that seemed to punch above their weight. Wreckless released in early 2002 was pushing the pixel shaders hard and in a way not really seen much elsewhere on the system. This isn't it looking at it's best but it give you a vague idea. https://www.youtube.com/watch?v=zHyuFBMs78E https://www.youtube.com/watch?v=zHyuFBMs78E But I suspect that as the relations between Intel and Nvidia soured, MS realize they didn't have a great path toward backward compatibility ahead of them. By enforcing the TRC more and pushing things like XNA they could at least focus the games so that emulation via PPC wouldn't be such a huge task. So you had things like Halo 2 and Doom 3 get support long before a lot of earlier titles, if they ever got support.