Not sure if this will help, but it's a data point:
The only time (two stretches, so far) that I got serious stutters was when my graphics card cooler was filthy with dust. And when I say stutters, it was like everything would freeze for a second or two, stream normal for 15-20 seconds or so, then freeze, then stream. It was beyond annoying. I had to take the cover off the tower, remove the cooling fan, and clean everything with a shop vac and a spray can of electronics "clean air". The last time it happened I got fed up even more and purchased a different cooling fan. But each time, cleaning everything out did the trick.