Do component video cables support a 120hz refresh rate? Or do I need an HDMI cable?
Without knowing more details, I am going to assume that you are talking about 120hz frame rate instead of refresh rate. Refresh rate means frequency of displaying the same frame, while frame rate means the speed of loading the next frame. In the context of HDTV, I think you meant frame rate. The frame rate of 120hz has nothing to do with your cable. All HDMI cables and component video cables can work with 120hz HDTVs. But, component video inputs on HDTVs usually go as high as 720p/1080i, not 1080p, while the HDMI input in your 120hz HDTV must be able to handle 1080p. Component video outputs in DVD players are ususally only 480p. So in terms of resolution, you still should prefer HDMI. Plus, HDMI carries audio also, in fact, better audio than L/R coaxial. TV programs are ususally 30 fps, and films are ususally 24 fps. Before the 120hz HDTVs came out, HDTVs are only 60hz (60 frames per second).
