screen tearing is a major issue on linux. theres lots of tweaks you can try to fix it but this is what finally fixed it for me. im on openbox using this and it works great. this tutorial is for xfce and im sure you can probably use it with some other desktops.
im thinking about adding a nvidia section to the wiki with tweaks for video. seems to be one of the biggest issues when people install. how to get the drivers on. why is there tearing. over and over i see the same things.
let me know if you try this out and it works for you. tearing is just the most annoying thing ever!