What VDPAU version is GT 600 series?

In Appendix A. Supported NVIDIA GPU Products
Geforce GT 640 is listed using VDPAU feature C.
Nvidia X Server Settings control panel in VDPAU information is listed API version 1.

What are exactly the VDPAU version and feature set ?

Thanks for reply.

The GT 640 can either be Fermi or Kepler based, so the exact chip is needed for an answer:
sudo lspci -d 10de:*

GT 640 Kepler GK208

GK208 has feature set D
The API version is always 1, there’s no newer one.

Thanks for your reply.