But i dont had normal game crash. I had TDR ( display driver crash ) . Must close game manually from task manager. So it can be card or just game \ driver issue?
Please help me fellas. I can still give card back to shop or stay with card. Thank you for recommendation.
display driver crash more often than not means the user has done something silly like trying to run their cards at a silly overclock. It happens to me all the time.

If you really are having all these problems listed above then -
1. Read a good book on PC hardware/windows.
2. Format C:
3. Complete reinstall
4. Latest NVidia drivers
5. Run the PC @stock clockspeeds
6. Don't expect miracles/perfection !!!