The 9700 is simply clocked slower than the 9700 Pro. It's almost as fast and can be overclocked to roughly the same speeds, but overclocking requires you to unlock the BIOS on the card
The 9500 Pro has twice as many rendering pipelines as the 9500, so it's a LOT faster. I don't recommend the 9500 standard unless you know for certain you can get the rare modifyable one, and have the skills to modify it.
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