RTX 2080 vs GTX 1080 vs CPU – For Streaming

Is the RTX 20xx series h.264 encoder even better at encoding video at low bitrates for streaming?

Gigabyte RTX 2080 Review https://www.youtube.com/watch?v=mUQR8OGK6E0
BEST SETTINGS – OBS (+ others) – CPU vs GPU Video Encoding… https://www.youtube.com/watch?v=yfPm5KbdAok
GIGABYTE GeForce RTX 2080 Gaming OC 8GB https://amzn.to/2pR3zvZ
GIGABYTE GeForce RTX 2080 Ti Gaming OC 11GB https://amzn.to/2ITypN5