Output resolution on the back of 360 game boxes different from ps3's.

[rckrz6]

• For whatever reason, the Pure Video scaler in the G7x derived GPU (RSX) is gimped to horizontal scaling of specific front buffer resolutions. See B3D Article
• As of the January 2007 PS3 SDK, only the following front buffer resolutions are supported for hardware scaling to 1920x1080p: 960x1080 1280x1080, 1440x1080 and 1600x1080
• Games whose back buffers are rendered at strange resolutions must upscale the front buffer (at a cost of extra memory) to either 1280x720 (720p output) or to one of the acceptable 1080p resolutions. (Note: native resolution = back buffer resolution, front buffer = image for displaying/hardware scaling)

Yes it has limited hardware scaling