But I noticed I still got some lag issues in some game, like Diablo 3 , hitman or Sleeping dogs.
I haven't tried any shooter in my pc.
But I already bought far cry 3, And I don't wanna have any issues, can u guys help me to find out what I'm doing wrong...
CPU could certainly be a factor ... Core 2 Quad is fairly old and yours is running on a pretty low frequency. Overclocking is not going to work due to your motherboard and if I'm not mistaken, it's running a PCIE 1.0x16 slot. Plus you're running DDR2 RAM.
Basically, you need a new mobo and CPU and possibly RAM. 7950 would be good paired with an i5, but what you can get is largely dependent on how much money you have/are willing to spend. At the moment your graphics card is the most powerful piece in your setup and is getting bottlenecked by the rest.
Umm that's a pain :S
Its there anyway I can just buy the CPU without buying a new MOBO?
Thanks so much for your time!
Unfortunately no. Your motherboard is not compatible with any newer/better CPUs. Plus the shortcomings I listed before. With your budget, I'd suggest buying one piece at a time until you have enough to rebuild your PC, but unfortunately you will have to get all new pieces as there really isn't a way to recycle any of the old. You bought a really powerful graphics card for a really underpowered rig, so it's going to take some catching up.