Im pretty sure they arent dedicated ASIC engines anymore. Thats why hacks like nvidia-patch are a thing where you can scale up NVENC usage up to the full GPU's compute rather than the arbitrary limitation nvidia adds. The penalty for using them within those limitations tends to be negligible however.

And on a similar note, NvFBC helps a ton with latency but its disabled on a driver level for consumer cards.

> Im pretty sure they arent dedicated ASIC engines anymore.

They are. That patch doesnt do what you think it does.