NvEnc speed question

[dvd_maniac]

I currently have a GTX 1070 and use it to encode video using NvEnc. I am looking to build a second machine for gaming and am thinking about another 1070 or maybe 1080Ti.
One of the deciding factors would be if I got a significant speed increase using the 1080Ti over the 1070.
Since the 1080ti has almost double the cuda cores and more memory does it marginally/significantly increase the encoding speed?

[poisondeathray]

Since the 1080ti has almost double the cuda cores and more memory does it marginally/significantly increase the encoding speed?

Generally not, because most of the work is done on the NVENC SIP core, separate from the "cuda cores"

However, some functions make use of CUDA, and may slightly impact speed depending on settings used


Although the core video encoder hardware on GPU is completely independent of CUDA cores or graphics engine on the GPU, following encoder features internally use CUDA
for hardware acceleration. Note that the impact of enabling these features on overall CUDA or graphics performance is minimal and this list is provided purely for
information purposes.

Two-pass rate control modes for high quality presets.
Look-ahead
All adaptive quantization modes.
Encoding with inputs in RGB formats.