G98-based GeForce 8400 GS models do have VP3. Most GeForce 9 GPUs only have VP2 as can be seen in the table behind your Wikipedia link:
http://en.wikipedia.org/wiki/PureVid...Purevideo_GPUs
Only G98 chips have VP3. This includes some of the integrated (mobile) GeForce 9 versions. The VDPAU announcement lists these and a more complete list that includes 8400 GS can be extracted from the drivers:
http://www.nvnews.net/vbulletin/show...32&postcount=3
Currently G98 GeForce 8400 GS is the only non-integrated graphics card that contains VP3.
G98 8400 GS is also manufactured with a 65 nm process.