Computer and Fps?

i use a dell 4700 to play crossfire, rofl i get like a 20-30 fps on a 8 v 8, with 512 mb of ram. Its expandable up to 4 GB, lets say i change it for 4 GB, What would be my average Fps in a 8 v 8???????????? everything else is stock cept went from an 80 gb hd to a 160 wich i dont think made a difference

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