3392mhz cpu speed, and Windows 7. Sounds to me like your cpu is an i7 2600k. Assuming that motherboard, whatever it is, has the bios to handle it, an i7 2700k would be the best cpu you could upgrade to. It would not be worth the effort to upgrade to this cpu.
A better idea would be to either get a better gpu, or just save until you can afford to build a better system.