That is fairly low, but keep in mind that your processor is only running at 2.1GHz. Frequency is a key element in getting higher FPS as is a large amount of cache (assuming its actually utilized). So overclock it as far as you can. Second you've got the original Phenom x3. It was literally just a defunct quad core, the new ones have remedied that issue. Third, the original GTX 260 wasnt that good, it was decent but not spectacular. They re-released it with more stream processors and i believe a die shrink to keep pace with ATI. both your CPU and GPU are made from a 65nm manufacturing process, which consumed significantly more power than the current generation and thus led to lower overclocks. Push them as far as you can, grab the latest drivers, and hope for the best.
thank you guys!
i found it very hard to OC this CPU. there were no option to OC in Bios and the software cant load it. right now all i need to do is to save money and get another CPU better than this. BTW, which one is more important? numbers of core or higher frequency?