ZUZONG Xbox 360 to HDMI Converter, HD Link Cable for Xbox 360, Xbox 360 to HDMI Support 720P, Compatible with Xbox 360 and Xbox 360 Slim.

This held up for a month then died. On closer examination I realized the connector wasnt sitting flush with the rear of the system. It cant because the plug is too big. I made some adjustments and still had issues. Turned out the HDMI port was damaged.

It works! We had the standard composite cables before and this completely transformed the picture on all games, even the ones not capable of HD output. Remember to go into your Xbox settings to change to 1080p output.

Works as advertised.