Graphics card crashed when I am playing Game.

I am a computer game addicted. I play the game 6-8 hours daily. My Graphics Card is EVGA GTX 580. It gives me a better service when I see video in the net. I can play low quality game without any fact.
But cannot play 3 D game on my PC.
It plays only for 5 minute. There appears some line in the middle of my PC.
After that my screen comes dark and takes restart. Here is my PC configuration:
- Intel Core 2 duo
- 3 GB DDR2
- Gigabyte
- Thermaltake Tough power 600W
This is the screen shoot:

Also, there are more unknown problem which i could not take a screenshot.
