I've just built a new computer and when I have Wattman open to monitor temperature, speed etc I get stuttering every second or so. Even if Wattman is open while running a benchmark like Unigine Heaven I see the frame rate drop right down then quickly recover. The stutter also pauses my mouse pointer while in Wattman.
If I don't have Wattman running in the background the RX 480 performs flawlessly.
I don't have this problem with my other computer which is an i7, this new system is has an i5 - I wonder could this be thread related?