Pour info :
Most Xbox games will run internally at 640x480 either with or without FSAA. If you use a regular TV, it´ll be 480i (640x480 interlaced). If you use an HDTV, you can run at 480p (640x480 progressive). Current high-definition televisions go up to 1080i (1920x1080 interlaced), and that´s also the highest resolution supported by Xbox. If you consider FSAA (Full-Scene Anti-Aliasing), 640x480 is plenty for a current generation console.
Xbox supports the following output resolutions:
480i (640 x 480 interlaced; regular TV and HDTV)
480p (640 x 480 progressive; HDTV)
720p (1280 x 720 progressive; HDTV)
1080i (1920 x 1080 interlaced; HDTV)
Liste des jeux xbox et de leurs résolutions :
http://www.hdtvarcade.com/xboxlist.htm
http://144.92.43.200/hdg/hdg.asp?s [...] Sort=xbox.
http://www.hometheaterforum.com/ht [...] enumber=1.
Forum Homecinema très complet:
http://www.homecinema-fr.com/forum/index.php