Re: vdpau fails - 180.37 - MPlayer SVN-r28942-4.3.3
I'm certainly not aware of any bugs specific to the 9500GT. It should work just fine with VDPAU.
Any markings on the box are targeted at the Windows driver, so aren't authoritative for VDPAU, but again, this card should work.
I'm not sure exactly what the test results under Windows mean. Certainly, things that don't outright work potentially indicate a problem with the hardware (but not definitely). However, there may be many reasons for fallback to SW decoding (application/decoder SW specific, resource limitations, or indeed the problem you're seeing under Linux).