^Agree with above unless you are playing really old games they will not much good for gaming.
I have intel core 2 duo e6550 2.3ghz and 2gb ram I will upgrade my ram to 4gb then I can play gta iv,street fighter 4,far cry 3 etc games on NVidia GeForce gt 240 1gb ddr2 card?
GT240 is a very weak card those games you mention low settings might be even a huge problem. Take a look at the comparison vs a GTX650 $120 card depending on where you live.