Sorry, I forgot about the NTSC system. btw regular NTSC requires a little more bandwidth than 29.9KHz actually. Closer to 31.something KHz (my old CRT projector support up to 30.5KHz and it isnt enough). Some bandwidth is also used for refreshing horizontal too. But close enough. Anyway, the LCD monitors can change refreshrates, they just cant change resolution. So by having a 75Hz LCD monitor you can just as well use 60Hz on it. So by tying this into the wrapper-side of things, all LCDs can use 60Hz with vsync on in the wrapper.
