Wasn’t sure if I just got lucky or if this was by chance. I followed your Calibration settings guide for this TV (along with doing my own tinkering) and once I set the HDMI to “PC” I got 2 extra resolutions supported under “PC Resolutions,” I noticed I had 3840X2160 set to @120Hz and thought hmmm, how is this possible? Keep in mind I currently have a GTX 1080. I gave it a mouse cursor test and web page shake test and it matched my PG279QZ’s 144Hz panel in motion, awesome! Tried Resident Evil 2 out since it’s the only game I have installed and that actually recognized and supported 3840X2160@120Hz. Wasn’t exactly able to push over 70-80 frames but from what I tested it still felt smooth so it was a pleasant surprise.