The Problem:
My computer visuals skip fairly reliably from what I can discern about 3 times per second. It doesn't matter what application or game I have open; it's universal to all graphics rendered by Windows. This makes all motion in videos, games, etc "hop" or "pop" over the skipped frames. One really good way I can see the effect is a YouTube video of the old school DVD logo bouncing
I previously had a variety of pc component software installed; Armoury Crate, iCUE, L-Connect, etc. But having found these forums I have uninstalled *all* of them. Very little is actually running on my PC, at least based on what I can see in Task Manager. And yet, the issue persists. It's so annoying!
I'm running the Animation TIming Deviation test and it *seems* to be showing the frame skips at pretty regular intervals: The second image shows that the skips(?) are on average about 33ms "tall", whatever that means. I don't fully understand the graph, but it does seem like they're happening at regular intervals. I even put the DVD animation in a window and overlayed it to the timing graph, and as best I could tell the hops lined up with when the red lines were being generated on the deviation chart. Naturally, I also get the big red "SYNC FAILURE Unable to VSYNC" box.
Again, none of my RGB software is running but the issue is still happening. What should I investigate next? Motherboard configution? Bad RAM or PSU? I'm really at a loss here as to what to do. Thanks!

