The NVENC hardware encoder in Turing is actually comparable to x264 at fast / veryfast. This card will be quite interesting to Twitch streamers as it opens up the possibility to stream without CPU impact for those with a limited budget.
I think some charts with SSIM measurements at various bitrates and resolutions etc. would be way more informative than a youtube video.
Is the hardware encoder the same in every Turing based card or should we expect different performance when comparing ultra high end to mid range? (2080TI vs 1660TI)
It appears so far that the NVENC chip has been the same in all the RTX 20xx cards. I haven't looked into whether that is the case with the 1660 TI, but I wouldn't be surprised if it was.