You went from a Geforce 7900GT to a Geforce 640. - It's an upgrade in everything except memory bandwidth. (Won't be an issue unless you're trying to push 1080P max quality settings, if you expect that, you bought the wrong card.)
For $100 though? Ripped off. I would have tried to look at a second hand Radeon 58xx series card or a 69xx series card.

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