Ho to set a video card to 1080p?

I have the Nvidia GeForce 9800GT video card, but, how can I know if the video card is set to 1080p?

Someone told me that if the Refresh Rate is set to 60Hz I can watch movies in 1080p, is that true?

thanks|||yes but you have to change also your aspect ratio to 16:9 then change your desktop resulotion to 1920×1080.....just try it