What is "Force the exact value" under FPS change option? Does it do good or bad? It force 120fps if on and 119.88 when of. Which one  is better?

Should I use 5x or 120fps for better smoothness?

What is "Width of top coarse level" ?

"Exact value" is useful for VR devices because they have fixed frame-rates.  If you hover over each SVP option, a tooltip will come up explaining what each option is for. Or you can Google it and get even more detailed explanations. I can never understand questions for "better smoothness" without even trying anything yourself first.

P.S. I took my own advice, did more searching and found new information. Bottom line as I have said before is that the SVP defaults are mostly correct. But depending on your GPU and CPU they can be tweaked to produce optimal results

Should I use 5x or 120fps for better smoothness?

What is "Width of top coarse level" ?