You will struggle to get much out of it with that Ram. The best thing to do is to bump up the FSB a couple at a time and then see if the machine is stable.
I doubt that you will get very high though, best thing to do i would be to try and get your hands on some 3200 RAM.
For better games performance, try clocking the Graphics card too. Get the app Rage3D and raise the FSB on that too.