Fps problem!

I have 3GB RAM, 320GB HDD, 2.0 GHZ, and a default 8 MB video card. I had 1.86-87 GHZ and I had 9-12 FPS now I put 2.0GHZ and its from 20.0 to 49.0.
What can I do? buy a 2.7GHZ CARD? or what can I do?

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