Before that you can check and see if your motherboard allows for overclocking. Most C2D's overclock pretty well and you may be able to get enough out of it to make the majority of playable games full speed... but GT4 will likely still be out of reach.

Thx Register, tried native mode and it works.
But I guess i'll still gotta upgrade my pc (what I was planning anyway) cuz it aint working perfectly. Some situations still lagg and I cant play at full screen, but hey, I can play .
For now only tested FF XII.

Thx to Koji too ofcourse, for the info bout the cpu

Your graphics card is enough for most games, and your CPU typically overclocks to around 3-3.2Ghz on stock voltage, or around 3.6Ghz with about 1.35-1.4v. If you can, overclocking your CPU should give you almost full speeds without wasting money (though you might need a better heatsink if you intend to increase voltage).

Good to know booger, i'll check out the overclocking. Just never did that before so gotta be careful right

You also have to be sure you have a mainboard that can support the OC. Some boards will not even give you the option to OC, and some may even burn when OCing. (like some cheap P55 chipset boards for example)

Abrakas, for cheap upgrade you can get nvidia 9600gt or equal from ATI. 8400gs have bottellneck with system even with native res ON at gsdx plugin or overclocking cpu (this is you can try it too but with proper know-how and knowledge too first).