In my case it is with certain programs I use. One of them is Mandelbulber, a 3D fractal program. Most of the time I render with my GPU and all is fine. But certain settings can only be done with CPU renders and then 100% of CPU is used and the stutter appears.
With most other applications (including gaming) my GPU is used and there is no stutter.
The Node Pro is attached to a sata power cable where also 2 SSD's are attached. But when I render, the SSD's are not use at all.
But it indeed looks like a power issue. When I close all Corsair services and iCue, it falls back to it's hardware setting. And then also the stutter is there.
So, all in all not a major problem. Just a bit strange :)