For those wanting to use nVidia HW decode and encode this information may be of use.

[VisionxOrb]

Haven't seen it mentioned here before, apologies if it is. here is a list of cards and there number of chips/streams and h264/h265 features.

Video Encode and Decode GPU Support Matrix

Also a driver patch to unlock unlimited encode streams on non quadro cardskeylase/nvidia-patch

 

[VisionxOrb]

According to nVidia, turing boosts nvdecode throughput by quite a bit.