In our Intel Arc A380 review, we introduced video encoding performance and quality testing using FFmpeg. We wanted to do the same sort of testing — and more — on the RTX 4090, though time has conspired against us.
To quickly recap, Nvidia's Ada Lovelace architecture includes a new 8th generation NVENC block, which adds support for AV1 encoding. On RTX 40-series cards with 12GB or more VRAM, there are also dual NVENC blocks, which can either work on separate streams or double the encoding performance of a single stream.
The new NVENC allows for encoding at up to 8K 60 Hz, for the 0.001% of people that have such a display. No, I'm not jealous. Why do you ask? (Yes I am, and I'd love to have an 8K display for testing gaming performance as well while I'm here.) Maybe we'll even get 8K 120 Hz support in the future, using both encoders.
We'll update this page with our testing results once we've finished doing the testing, so stay tuned.