RTX 20 series NVENC Spec

Does anyone know where I can find this info? All I can see from Nvidia website is that RTX 20 series are using Turning encoder, and all of RTX 2060, 2070 and 2080 have 1 NVENC and can run 2 sessions concurrently. My question is, do they have the same encoding speed in terms of number of pixels per second?
For reference, the Jetson AGX Xavier listed their encoder’s processing speed as X MP/s: some have 1000MP/s and some are just about 500MP/s, so I’m assuming there could be difference in the actual throughput even if they are all Turing encoders.

You can find NVIDIA NVENC User Guide in https://developer.nvidia.com/nvidia-video-codec-sdk/download , in this guide, you can find below statement.

With every generation of NVIDIA GPUs (Kepler, Maxwell 1st/2nd gen, Pascal, Volta, and
Turing), NVENC performance has increased steadily. Table 4 provides indicative1 NVENC
performance on Kepler, Maxwell, Pascal and Turing GPUs for different presets and rate
control modes (these two factors play a major role in determining the performance and
quality). Note that performance numbers in Table 4 are measured on GeForce hardware
with assumptions listed under the table. The performance varies across GPU classes (e.g.
Quadro, Tesla), and scales (almost) linearly with the clock speeds for each hardware.