A person on the Beyond3D forums tested various games, and found that some 360 games don't even run at 720p, and are instead upscaled to it. Halo 3 and Perfect Dark Zero, for example, run at 640p, while PGR3 and Tomb Raider run at a measly 600p.

It has also been noted that it runs at 1138x640 with only Bilinear filtering, no Anti Aliasing, and gets roughly 30 frames per second average.

To quote gamerwar who explains the math behind the calculations:

quote

Each “step” in a jaggy alias l...

Guticb via forum.beyond3d.com »