just to add and emphasize on it: I also never had a problem with tearing, from my Riva TNT, GeForce2, FX5800, 8800 GTX and also my GTX 460 untill last October. Now with the GTX 660 Ti it hits me 1st time, and its awful. Especially because the tearing has a very remarkably pattern like “sawtooth”. It is eye catching more than just a single line tearing.
"Adaptive Vsync if I’m not mistaken is only enabled for OpenGL applications. "
—> Yes, correct. But for me almost everything uses OpenGL: the KDE compositor, Firefox (I use Seamonkey but it is same basis)… But even vlc playing video using xv is some how badly affected. Flash some times, especially if i have more than one instance of flash player in tabs of browser. Mplayer with VDPAU works best until, least effects if some visible there.
I really urge one from Nvidia to comment here. As i feel wasting my money with the Kepler card, and I have found none of a workaround. That it is adaptive sync is my only guess by logic, as it is implemented firstly in Kepler. And it may be not only an issue of the driver, maybe it is a problem caused by many causes, but without the help from Nvidia we can’t get around this.