As previous users said, It's your old GF card that cuts off performance. Buy the new GTX and everything will work smooth as silk. With my specs I can play any game with 100% speed without any problems.
Intel Pentium Dual Core E5200 OC @ 3.0GHZ stock cooling
Ge-Force GTX 260 896mb
4GB RAM Corsair 1066mhz
Windows 7 X64 ultimate
Ge-Force GTX 260 896mb
4GB RAM Corsair 1066mhz
Windows 7 X64 ultimate

