1) is there any temperature difference between side panel with fan and side panel without fan?
2) how to produce positive pressure with the case that dont have side fan??( front and top fan are the same and 1 more back fan)
There is a difference in temps, but its not an amount that would be really noticed. Maybe about 3-5 ambient. The GPU that its blowing on would have an affect as well but not enough that would be noticed. As for pressure, make sure all fans are intake.