120Hz @ 30fps / 60Hz @ 30fps

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Doesn't that make the 30fps look like 60fps, since it flickers the screen four times, instead of the current two (60Hz)?



I don't know how else to explain my view, but I try:

30fps*4x = 120Hz / 2 = 60fps (FRAPS still says 30fps of course)

Even if it flickers four times instead of two, if the graphic card can't give the monitor a new frame to display, you'll simply see the same picture four times in a row instead of two.
It's like if someone is putting boxes on a conveyor belt - the speed of the belt has no effect on the speed of the guy putting stuff on it.

now I don't know much about TVs, but here's an article that might help you with that:

Click

In a nutshell, it says that 120 Hz Screens interpolate between the pictures to create a smoother effect, but your broadcast still only gives it 60 pictures per second to work with. When you watch an old movie (24 or 30 fps) the interpolation effect can even be too extreme and look unnatural.