Started a while ago when I noticed it in Plex that I couldn't watch a movie without the framerate going to ~1 and literally hanging for a half-second every couple of seconds regularly (the audio even hung for the same amount of time). Now, I am seeing it also in Stellaris, and now again in Dawn of War III. I have re-installed my drivers twice. It did not have a problem in 3D Mark Firestrike or on the desktop. My Fury is water-cooled custom, but the loop temps are extremely low (13C as I write this and rarely above 30C at full load).
Please help! For a while it was manageable, but it's beginning to be unbearable.
I have attached a video of it happening on the opening cinematic of DoW III. My PC shouldn't struggle with that .