| Is the setting in the xbox' defaults, or is it in the game? |
It is in the Xbox settings on the dashboard. The Xbox will use the best resolution that is available, so if a game supports 1080i, 480p, and 480i & you have all 3 selected in your dashboard, the Xbox will display 1080i. Likewise, if you have only 480p selected, the Xbox will display that.
-Dave