I've a AMD Athlon X2 dual processor with a speed of 3GHz.my ram space is 3GB and HDD is 500GB.please suggest me the best graphic card to play high end games.
It depends on your budget. Low budget HD4670, medium budget HD4770/GTS 250, high budget HD5770. I wouldn't recommend anything more powerful than that with your CPU. You should look into OCing that processor btw, no matter what card you get.