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So what is a decent rate?
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Generally, there is none. What's the refresh rate on CRT's for ? Right, to reduce the flickering (CRT flickers faster, human eye can't perceive the flickering at some point).
TFTs don't flicker. So what's the point of a higher refresh rate ? None.
The refresh rate just says how many times the picture is redrawn. At 60hz, it's 60 times a second, so it's also 60fps.
If you play a game, you can't get more than 60fps on a monitor with 60 Hz.
Now, if you lived in a PAL land, and wanna watch DVD, the optimal setting would be 75 Hz, as PAL is 25fps, and 75 is 3x25, so it fits. With 60hz, it doesn't fit, so the picture becomes a bit stuttering (most times you don't notice it anyway, but if you pay attention, you'll see it). So you change it to 75 Hz to have a smooth playback.
That's the only reason to change the refresh rate of a TFT, actually.
RJ