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Contrary to the last statement for myself optical flow has not been fixed for the rtx 3000 series cards yet.  I had a gtx 1660 that worked flawlessly with optical flow (a second gpu I bought for that purpose to supplement my 5700XT).  I have an i9-9900k and playing a 50-100gb blu-ray at 1440p @ 165hz, I was only using about 15%+/- of my cpu which was phenomenal.  I use Linux (NVIDIA 460.56 drivers), however I do have the paid version for Windows as well.  Unfortunately the issues persists across both platforms with this new card with clean installs on both.  Basically it is exactly what others are describing - it's unwatchable do to the choppiness, as in completely broken.  I have tried every possible combinations of settings and suggestions that I've read to no avail.  Regular gpu acceleration is fine on both platforms (maybe not so much with Windows though with large files), and works as it always has but it's just not a long term solution knowing optical flow exists.  It's night and day with system usage, and a slight bump in quality too.  I do see a bit of a discrepancy wherein the problem may lie, although it's just a guess and I'm by no means an expert with these things - in GreenWithEnvy in Linux the 3070 shows 0% encoder use,  whereas with the 1660 using optical flow it was somewhere in the neighborhood of 10-30% at all times when playing videos.  Hopefully whatever the issue it'll get worked out soon, and thanks for existing - I couldn't live without this program!