How to play Xbox games in HDTV
If the game box says "HDTV 480p," "HDTV 1080i," or "HDTV 720p," that means the game benefits from an HDTV connection.
To take advantage of the higher-quality graphics in these games, you'll need to buy a special adapter. Microsoft sells the official adapter as the "Xbox High Definition AV Pack." You can also get compatible adapters from Monster Cable and other manufacturers. This adapter replaces the one that came with your Xbox. Just plug it into the slot on the back of the Xbox and connect the outputs to the appropriate jacks on your TV or A/V receiver.
Once you've connected the adapter, you'll need to set up your Xbox for HDTV display. Please note: If you have a game disc in your Xbox, take it out of the tray. Now switch your TV to the input where the adapter is connected, and turn on the Xbox. You'll see the main dashboard setup screen. Navigate to Settings, then Video. Now select the wide-screen option, and choose the resolutions your HDTV supports - such as 480p, 720p, and/or 1080i. If you're not sure which resolutions your TV can handle, check the manual or the manufacturer's Web site.
Now you're ready to game in HDTV. Just put in one of the hundreds of 480p-capable titles, or better yet, one of the few 720p and/or 1080i titles, and enjoy a whole new high-resolution gaming experience.