Suggest me a good graphic card .



your processor will limit the peak performance of any of the new gen cards, be it amd or nvidia.
to run new games you have to change your processor and upgrade to 4gb ddr3 ram as most of the new games require at least that much.even if you have a very powerful graphics card new games will not run smoothly
 
Wht if I buy another 2 GB DDR2 RAM

 


you want to play the latest games on your pc right?
then getting another 2gb ddr2 wont help, you have to change your whole rig.