For my rig, I have been upgrading it for the past year trying to get rid of this stutter that made games unenjoyable. I think I found my fix. In my bios, my CPU core voltage was bouncing from 1.18 volts to 1.17 volts on auto. A while ago I didn't think this was the problem for my performance issues nor did I know that I could change it. Only last night did I figure out how to change it and I bumped it up to a steady 1.2volts; so far it fixed all my stuttering issues.