1440x900 at what graphical quality?
I'm assuming you have a socket AM2 board, so any AMD Socket AM2/AM2+ CPU that runs at 3+GHz will significantly increase performance (the best you can do is the Phenom II X4 940). As for RAM, I'm going to assume it's DDR2 800MHz, and you should have 4GB of that. Video card is fine for 1440x900, but if you want more eye candy, go with the HD4770 or better.
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