No, there is not any CPU core being "pegged" on my system. I think I told you I use MSI Afterburner to measure the metrics while I play so nothing gets past me; Borderless or Fullscreen have identical CPU usage, only I get slightly higher GPU usage at Borderless (obviously). And I have no idea what you mean by desktop "420 or 422". So far I have no idea why the MSI setting impacted smothness on my end with this new driver. As I said, all I did was delete old one with DDU, then install this one without GFE. I will have to do more testing on my own and come up to a conclussion of my own. Every system is different after all.