The "snow" you are seeing is caused by the way the Clip's screen works, it is an absolute miracle that it can display video at all...no matter what fps you use, you will still get this "snow", the Clips screen can only produce two colours, blue and yellow.
It tries to replicate different shades of these two colours by rapidly blinking (turning on and off) the pixels to trick your eyes into seeing lighter or darker shades.
I hope this helps, the short answer is that the problem is with the Clip display, not the video frame rate.
[St.]