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Halo 2 HD is a mod for the original Xbox version of Halo 2 to add support for HD resolutions as well as some quality of life updates. This mod will let you play the game in 480p (proper), 720p, and 1080i (1080p internally).
All of these features are customizable through an ini config file and are explained in detail in the wiki: Configuration File.
Halo 2 claims it supports 480p on the box but this isn't entirely accurate. It DOES support 480p output but it does NOT render in 480p natively. Regardless of what video settings are set on the console the stock game will always render in 640x480. When 480p output is enabled the console will upscale the final 640x480 image to 480p for display on TV. If you enable widescreen mode the game will also apply anamorphic scaling to the image which causes it to appear "compressed" width wise.
This patch addresses those issues by rendering in proper 480p resolution and disabling the anamorphic scaling that would normally get applied. It also allows you to play the game in 720p and 1080i. When 1080i mode is enabled the game is actually rendering at 1080p internally before being encoded into interlaced video signal. The 1080i mode is not considered "playable" as it puts an extreme load on the console GPU (even with overclocking), and typically plays at single digit FPS at best. I added support for it mostly because I wanted to see if I could get it to work and also so I could take some sweet screenshots before the frame buffer gets converted into interlaced video.
