The comment about frame stutter intrigues me. I have seen this across multiple programs, so I'm not sure what would make Vdub different in this case. I always assumed it was some weird quirk with my system though, but yes even at 60fps it is very annoying. I can detect when it happens and sometimes its a few frames in a row, or a couple frames and a short gap and a couple other frames. etc.
I haven't really tested it with games other than Dirt Rally though, which is why I've let it slide because that game does have its own quirks with FPS (if you turn off Vsync it becomes choppy its hilarious).
But its weird, I've seen choppiness even when capturing with NVENC via OBS doing the job. I did try shadowplay but it produced VFR footage which is ridiculous and no good for editing.
I've seen stuttering in AMARectTV recordings as well. Perhaps it was a little improved, but overall, still stutters.
But maybe I'll give vdub another try. Any general tips on setup? I can sort the codec stuff out (x264vfw is easy enough).