It would depend what's causing the stuttering or lag. From my x4 760k days I found some games were more sensitive with other software, so closing down all unnecessary tasks will help a bit (eg. an open browser). If running games from a mechanical hard drive then defragging it occasionally might be beneficial. And sometimes verifying games cache can help resolve some odd issues.
After those things, I would suggest using MSI Afterburner to monitor the system's performance (in conjunction with AMD Overdrive). Monitor CPU (all core threads), GPU and RAM usage and frequencies; CPU and GPU temperatures; fps and frametimes; and maybe page file.
My suspicion is the games you're playing maxes out the CPU so it can't possibly push any more frames. With Afterburner's graphs, see if this is the case when you get fps drops (or extended frametimes).
Additionally see if lowering graphical quality helps improve stability. I lowered game resolution to increase fps in a handful of games, which might be something you'd want to try to see if can be made more consistent.