FFMpeg Encoding Performance Comparison of nVidia products

We are now developing Software based Encoder/Transcoder for contents and we would like to use nVidia GPU Acceleration function.
Thus, we need your help to choose which nVidia product we are supposed to purchase.
It will be much appreciated if you forward us the “Performance Comparison data of nVidia products” when we encode with FFMpeg.
If you need us to do things to receive the performance comparison data, please let us know.

Probably, you can refer to the supported gpu list…

Thank for your reply.
I don’t want to get sepported gpu list, but Performance Comparison data of nVidia products