i have a gforce 2ti 64ddr and when i run media player, i use the ambience warp in full screen mode. when i switch it to full screen, it goes alot slower. i have 512ddr system ram also. what is the best refresh rate to use? mine has 60, 70, 72, 75,85, 100, and 120hz in the drop down. if i change these,do i need to change the screen res too?