Originally Posted by Calcvictim
Isn't that why he is asking whether to play it at 24hz or 60hz.
The point is that the input circuitry of his display very likely does not have the bandwidth nor the timing circuitry to decode a 120fps video stream.
if you play it at anything less then 120hz then the speed will actually be slower.
Not so. If the display could actually capture the incoming 120fps video stream, it would display every other frame at 60Hz or every fifth frame at 24Hz. It would be like a "strobe stop-motion" effect.