7600GT to 8500GT - Much Difference?

How much better would the 8500GT perform compared with the 7600GT? Both 256Mb and PCIE. Is it worth upgrading and would the other components in my comp make much difference to this?
E6600, 3Gb Ram DDR2, IDE 200Gb HD

there is a chance it might actually be slower.

8500 is not a direct replacement for 7600 series, if you have 7600 your next step would be 8600.

only thing you would gain from 8500 would be better hardware video decoding, and dx10. but DX10 games on 8500 is just stupid idea, since it would run slow as hell.