The 9500 PRO has 8 pixel pipelines, just like the 9700 PRO.
The 9500 non-pro is a 9500 PRO chip that has been gibbled by disabling 4 of the 8 pixel pipelines.
A 9500 non-pro has only 4 pipelines. It's alot slower... more like a Radeon 8500 as far as rendering power goes.
To complicate matters, there are mods out there that can enable those 4 pipelines on a 9500 non-pro to turn it into a 9500 PRO! But the problem is it doesn't work all of the time. The failure rate is between 25% and 75%, no one knows for sure.
The safe thing to do is get the 9500 PRO.
It's an amazing card for the price.