On my Geforce setting max prerendered frames to 1 seems to remove most of the judder at 60fps. Try it with AMD's equivalent, Flip Queue Size.
Not sure how to do that, apparently it doesn't work with RadeonPro on DX11 or something.
Thanks for that writeup. So would you say all Ultra at 30 FPS is possible with the 280x?
No, ultra foliage + ultra shadows will brutalize your framerate.