I purchased the nuc a few weeks ago, and I noticed when playing a game it jitters rather annoyingly every 4 seconds or so. I decided to run a controlled benchmark to see if I could notice anything.
Here are my results of the benchmark: https://i.imgur.com/KTP7k8J.png
I ran Unigine Heaven and just stared at a wall so it wouldn't disrupt my FPS. As you can see, every 4 seconds or so, like clockwork my FPS would drop then recover. As you can also see, my GPU Usage would also drop to zero. I have the most updated drivers, I've deleted them and re-installed them, I have no idea what else to do. Does anyone have any ideas here?
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I don't want to make any assumptions but it looks like you are running MSI Afterburner to monitor your frames and temps.
Can you take a follow-up screenshot that shows the following: GPU Memory usage, GPU clock speeds
I attempted to recreate your situation and was unable at the time to do so.