Will I benefit from upgrading from G-Force Fx-5200 to Fx-5700?

I have a G-Force FX 5200, and I am thinking of upgrading to FX-5700 (G-Force). Will I gain anything? Or will it be a waste of money?
If so what are my options ( I want AGP versions and less than $ 100 ) both Nvidia and ATI are considered.
Please I want your advice.
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