First the biggest area of difference is usually in things like AA/AF, and at resolutions above your current one. But scottchen is right, there won't be too much noticeable improvements without tweaks.
Here's a few good DX9 benchies/demos [that look good too]
<A HREF="http://www.daionet.gr.jp/~masa/" target="_new">http://www.daionet.gr.jp/~masa/</A> the rthdribl v.1.2 demo is VERY sweet.
<A HREF="http://download.guru3d.com/gunmetal/" target="_new">http://download.guru3d.com/gunmetal/</A> Gunmetal isn't truely a DX9 benchmark but does have some aspects of DX9 added ontop.
<A HREF="http://download.guru3d.com/pafiledb.php?action=file&id=661" target="_new">http://download.guru3d.com/pafiledb.php?action=file&id=661</A> X2 is not PS2.0 based Bencmark but is VS2.0 based (another aspect of DX9) [was very slow to donwload for me, just to let you know]
<A HREF="http://www.futuremark.com/products/3dmark03/" target="_new">http://www.futuremark.com/products/3dmark03/</A> 3Dmark03 of course.
<A HREF="http://www.shadermark.de/start.html" target="_new">http://www.shadermark.de/start.html</A> Shadermark ain't glitzy but it does have good info.
Hope that helps.
I would also recommend the R9600P as a better choice, even the R9600non-pro is better than the R9500non-pro IMO.
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