I just upgraded from a Phenom II 965 to an FX 8350 all stock speeds, and have seen no noticeable difference in gaming performance. Now with that said, I have had no problem running Far Cry 4, or Shadow of Mordor on ultra using a higher end graphics card (GTX 780). I haven't used FRAPS or anything to record my actual frame rates, but I can say that I have had no slowdowns or lagging that I have noticed yet so, for gaming I'd have to say that the Phenom II 965 is plenty capable if you have a strong enough graphics card. I would suggest switching to Intel for any measurable gaming performance gain over the Phenom as FX hasn't shown me any difference.