GeForce GTX 6500 Ti Screen Tearing Problems

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http://askubuntu.com – I'm experiencing the tearing artifacts on GeForce GTX 6500Ti graphics card under Ubuntu 12.04. Apart from tearing, the card runs games decently. On my old video card (GeForce 9800GT) I've had absolutely no tearing on the same system. The tearing is especially noticeable when: moving windows horizontally, in upper half of the screen, watching div-x videos (in my opinion it makes movies unwatchable), the artifacts are also mostly located in upper half of the screen in some 3D games, but not all of them. My system is: 1920x1080 monitor connected through DVI AMD Athlon(tm) II X2 250 Process (HowTos)