I am using it OFF by default and never had any problem on my TV (and watched some 100 movies allready on my TV-out) but never used S-video. The card does have an S-video out but in there I am using an s-video to composit adapter. So, I am waching 23,976 fps movies on a TV set that works on 50 Hz interlaced and also 59.94 fps movies on the same TV . How does it sincronize ? It does not need, as the refreshing rates for both TV and monitor, are greater than human eye perception, you can't see when the image is changing.
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