I'm not 100% totally sure of the situation, but I think that it's as follows:
- 6xxx, 7xxx
- In Windows: PureVideo: accelerates only mpeg1/2 streams.
- In Linux: XvMc: accelerates only mpeg1/2 streams.
- GF 8 or higher
- In Windows: PureVideo-HD: accelerates mpeg1/2, h264, WMV/VC-1, etc.
- In Linux: VDPAU: accelerates mpeg1/2, h264, WMV/VC-1, etc.
Sometimes the NVIDIA ads mix up PureVideo and PureVideo-HD.
I would like to know though what features are exclusive to PureVideo-HD that VDPAU don't support yet (or will never support).